- Estimated achievement difficulty: 7/10
- Offline: 39 
- Online: 0
- Approximate amount of time to 1000: 20-40 hours [Depending on skill]
- Minimum number of playthroughs needed: 2 and multiple playthroughs of single missions
- Number of missable achievements: None!
- Glitched achievements: None!
- Do cheat codes disable achievements: No cheats
- Does difficulty affect achievements: Yes!
Even though this game is a relatively simple 900, the remaining 100 will take some time and skill, which is why it gets a 7 for difficulty.
Welcome to Armored Core 4, a fast-paced Mech action game that will likely take some time to get used to the controls maybe more so than any other game. The game has 39 achievements, which will require a minimum of two complete playthroughs (one on normal and one on hard) with additional single mission playthroughs to get any S ranking you may have missed. 23 of the achievements will be obtained simply by completing both the normal and hard playthroughs; the remaining 16 are achieved by obtaining certain total mission rankings and by defeating certain groups of enemies in the arena.
Step 0.5: Choose your playing style
Prior to begin playing you will have to select one of six ACs, each with different attributes for very different playing styles. Of those six there are three that stand out. There will be a balanced (TYPE-HOGIRE), a fast lightweight with low firepower (SALAF) and a heavy beast (GAN01-SUNSHINE-L) with great offense and defense but with rough mobility. Keep in mind that you can change them as you progress through the game to your liking but for the purpose of preparing for missions that will require great speed and mobility I strongly suggest starting out with the SALAF AC. Not only will you get used to playing with great speed but also this AC is, in my opinion, the easiest to adjust for different types of missions and its original weapons and body pieces are great for the first few missions. Once again, this is my opinion and above all you are suggested to play the game to your liking, but for future achievements I found using the SALAF AC to be the easiest. Also, don’t be put off by when it says that the controls for this AC are difficult because they aren’t. The key in this game is not to sacrifice mobility for defense, since its better to avoid getting hit than being able to take damage. Having an AC with high energy is very important in this game. More energy means: more damage for energy weapons, longer flying time, increased mobility which means a lesser chance of getting a fatal hit; even if you don’t use energy weapons, low energy will not allow you to keep up with enemy ACs in some missions causing you more grief and difficulty that you obviously don’t want. For this I suggest maxing out the following in the FRS: The first 3 from Capacity and either Mobility, Attack or Acquisition) which helps you maintain a lock on of your enemies at high speeds).
Note: Turn Auto Weapon Switch to off. Unwanted weapon switches is the last thing you would want in this game.
Step 1: Normal playthrough
Since you will have to playthrough the game on a harder difficulty, I suggest using this playthrough to get used to the controls and by knocking out all of the arena-related achievements. Since it will be impossible to get an S ranking on many missions with your starting equipment you should concentrate on learning to play and saving your money. As soon as you can, buy a pair of Ogotos for your AC, these are one of the best weapons in the game and will remain useful during both playthroughs and through the S ranking runs. For the Arena related achievements the only weapons you truly need are the Ogotos. As long as you have a high mobility AC with a pair of Ogotos, no one in the arena should give you any trouble. This playthrough should take you around 10-15 hours give or take a few until you are fully in-tune with the controls and the concept of the game. As you progress in the game new arena groups will become available and you should complete them as soon as you unlock them since they give your AC parts that can’t be obtained through missions. By completing this playthrough you should have unlocked the following achievements:
Step 2: Hard Difficulty.
Now is when it gets interesting, but by now you should be a pro and have nothing to worry about. One or two difficult missions lay ahead but if you make good use of the videos (located on the guide below), The Mission Help Thread and Despised Icon’s schematics and tips for the hard missions you should be okay. For some missions especially the ones that unlock achievements try getting an S rank on your first try because once you do them you won't want to go back for that S rank. Once finished you should have unlocked the following:
Step 3: S ranking mop-up
There are 74 total missions (37 normal, 37 hard) in which you must get an S ranking to obtain your full 1000. You should make use of the video guides and Despised Icon’s Achievement Guide Thread (link) if you are having difficulty with any mission, you can also go to the Mission Help Thread here. After this you should obtain the A, S and SS ranking achievements totaling the remaining 60.
At this point you should have your 1000 or are most likely missing an S ranking on some missions. Remember, patience is key when going for the S ranks, look at the mission requirements for it and find out what you can do to meet them. Even though some seem impossible, none of them are. I’d like to thank Despised Icon for his schematics and mission tips and for a great guide. Good luck!
Finish the first mission of the game “First Strike” for this achievement.
Use the BurnOgoto mech.
When the mission starts, hit both bumpers to switch to the Ogoto's on your back. Than fly over the first city section, than over the water with the bridge. Right at the end of the bridge is 3 enemy Normals. Use the Ogoto's to destroy the 3 Normals with ease. On Hard, there will be 6 enemy Normals to deal with, but once again the Ogoto's are the weapons to use.
The final mission of chapter 2 is “”Desert Wolf.” It is the 9th mission of the game.
Swarm of Red Eyes: Use the BurnSirius mech.
When the mission starts, boost forward a bit to get closer to the swarms. Once the Swarms are close enough to lock on to, blast them with the ER-0200 rifles until you are out of ammo, than switch tothe Sirius cannons to finish them up if needed. On Hard, there will be lots more swarms and 5 flying drones, but still pretty easy mission.
Elimination: Use the BurnOgoto mech.
When the mission starts, there will be enemy drones on the room in front of you. Just start destroying them with either the ER-0200's or OGOTO's. Once done with the first room, go to the second room to finish up the rest of the drones. On Hard, there will be drones along with enemy Normals equipped with BIGSOUX, so be careful to dodge even though there's not much room. But again, just use the ER-0200's in the first room than sit back and fire Lamia backmount AS missiles into second room from first with out going in to destroy all enemies.
Dangerous Waters: Use the BurnOgoto mech.
When the mission starts, you'll be falling down a shaft, switch to your OGOTO's when falling. Also, be sure to use booster to avoid contact with the waters because they are littered with mines. Once down far enough, you'll see a big room with 4 enemy Normals to destroy. Just shoot them with the OGOTO's and that's it. On Hard, there are 5 enemy Normals to destroy , but just use the OGOTO's again and this mission is done.
Operation Descent: Use the BurnOgoto mech.
When the mission starts, you'll be falling toward a structure that you'll need to go into. First, switch to the OGOTO's while falling, than when you get closer to the structure, Lasers will start to fire up at you. Just boost and dodge until you are inside the structure, and once inside there will be 3 enemy Normals to destroy. Just blow them up with the OGOTO's to finish them up with no effort. On Hard, there will be more Lasers shooting up at you, just boost and dodge again. Plus,there are 5 enemy Normals to destroy, but again, the OGOTO's are the weapon to use.
Sharpshooting: Use the BurnOgoto mech.
When the mission starts, switch to the OGOTO's on your back while boosting and dodging the incoming laser. Now boost over to the 3 ground targets shooting the big blue lasers at you and destey them with the OGOTO's. On Hard, do the same as on Normal, but now there now will be 5 ground targets to destroy.
Bald-Dora: Use the BurnOgoto mech.
When the mission starts, fly through the canyon while either avoiding or destroying the enemy cannons on the way to the main objectives of 6 enemy Normals. Once you reach the end where there's a building, along with the 6 Normals, 2 are on the ground, 4 on the building, use the OGOTO's to destroy the Normals. On Hard, It's the same as the Normal difficulty, just that the enemies do more damage. So, be careful and efficient and it should be easy.
SandStorm Citadel: Use the BurnOgoto mech.
When the mission starts, use the radar to locate the enemy base where the nuclear missiles are that you have to destroy. All you got to do do boost and dodge directly over to the big red for on the radar to get to the nuclear missiles quickly, just ignore all the enemies. Once you find the base, destroy the nuclear missiles with the OGOTO's. On Hard, there will an enemy NEXT, but just ignore the NEXT and go straight to the nuclear missiles at the base and destroy with the OGOTO's.
Desert Wolf: Use the BurnSirius mech.
When the mission starts, switch to the Sirius cannons and boost over to the buildings. Once the NEXT is in the area, shoot it with the Sirius cannons to destroy it with little effort. On Hard, do the same thing as on Normal difficulty, but after you destroy the first NEXT, another NEXT will come to the area. Just shoot and destroy the second enemy NEXT with the Sirius cannons and it should be destroyed in no time.
The final mission of chapter 3 is “Internal Purge.” It is the 18th mission of the game.
Aerial Interdiction: Use the BurnOgoto mech.
When the mission starts, Use the ER-0200's to shoot down the 8 transport helicopters(they are the bigger helicopters). There will also be 4 or 5 fling normals shhoting at you, which you can either destroy or ignore, you're choice. Keep shooting the helicopter until the mission says "enemy transport is on the ground and moving quick", look for the train transport on the tracks on the ground to the left from where started on the bridge. Once you see the train, shoot it a few times with the OGOTO's on your back to destroy it. Also, be sure that no transport helicopter get by because you'll fail mission if that happens. On Hard, there will also be an enemy air fortress to destroy also. Just shoot it with the OGOTO's while doding to destroy. Do it quick because the train transport is still on it's way.
Icebreaker Defense: Use the BurnOgoto mech.
When the mission starts, switch to the OGOTO's and wait till you see a red dot appear on the radar. Once the red dot appears, boost over to it and destroy with once shot from the OGOTO's. Repeat this pattern until all submarines are gone.They appear in the same order and place everytime, so play it a couple of times to get used to where exactly they pop up at. There are only 8 submarines to destroy, so it should be easy to do. On Hard, there will be about 5 flying drones shooting at you, just ignore or destroy,your choice.
Water Gliding: Use the BurnOgoto mech.
When the mission starts, switch to the OGOTO's and boost to the first ship just beyond the buildings. Than proceed to destroy all the other 3 ships. Just ignore the enemies around you and concentrate on the ships. On Hard, Just do the same as on Normal difficulty, but this time there will be 7 ships to destroy with the OGOTO's.
Might Makes Right: Use the BurnOgoto mech.
When the mission starts, destroy the enemy in front of you, than proceed into the first tube. Boost straight up, than half way turn around and go into tunnel. Once you come out of the tunnel, drop straight down and proceed through the tunnel in front of you, but watch out for the enemy with the BIGSOUX equipped. Once get to the end of that tunnel, drop down again and go forward. The last 5 enemy Normals are scatter throughout the tubes and tunnels. On Hard, do the same as on Normal difficulty, but this time there is 9 Normals you have to destroy.
Barbe-Bleue: Use the BurnOgoto mech.
When the mission starts, switch to the OGOTO's and watch the radar. Whenever you see red dots appear on the map, boost as quick as possible over to the red dot and destroy with the OGOTO's. Just keep doing this pattern until all enemies are gone. On Hard, It's the same as on Normal difficulty. Just remember to be real quick and efficient.
Retaliation: Use the BurnOgoto mech.
When the mission starts, switch to the OGOTO's and boost over to each enemy group and destroy them with the OGOTO grenades. There will also be a few Normals that fly and boost, plus a couple Normals on a hill shooting missiles. On Hard, There will also be an enemy walking fortress. Just destroy the walking fortress with the OGOTO's and that about it.
A Dark Night's March: Use the BurnOgoto mech.
When the mission starts, switch to the OGOTO's and boost forward a bit until you find enemies on your radar. There will also be flair's being shot up into the air to help with visibility. Just keep killing enemies until you find an enemy walking fortress, destroy it quickly to end the mission. On Hard, there will be a few more enemies and there are also 2 walking fortress's to destroy.
Up In Flames: Use the BurnSirius mech.
When the mission starts, switch to the Sirius cannons and than just locate the enemy NEXT(he'll be the one boosting and shooting missiles) and melt him with the Sirius cannons. On Hard, it's the same as on Normal difficulty. Just be quick and efficient.
Internal Purge: Use the BurnOgoto mech.
When the mission starts, switch to the OGOTO's and proceed throught the tunnels to each of the 3 objectives, destroying the enemies along the way. Once you reach one of the objectives, destroy it with the OGOTO's from a distance. Do this for all 3 and that's it. On Hard, It's the same as on normal, but after you destroy the 3rd objective, there will be an enemy NEXT coming from the tunnel that you came from. Just destroy the NEXT with the OGOTO's and that's it.
The final mission of chapter 4 is “Juggernaut.” It is the mission 27th of the game.
Ego Boost: Use the BurnOgoto mech.
When the mission starts, switch to the OGOTO's and proceed to destroy the waves of transport helicopters before they drop off the enemy Normals. Continue to do the same for the next 2 waves of transport heilcopters and should be done in no time. If you dont get the helicopters before they drop the Normals, who'll have a little trouble, but just destroy the Normals with the OGOTO's if they are dropped off. On Hard, there will be an enemy NEXT after you destroy the 2nd wave, so be careful and destroy the NEXT with the OGOTO's quickly. Other than that, the mission is pretty simple.
FireFly: Use the BurnMoon mech.
When the mission starts, boost straight ahead quckly to the air fortress and slice it with the MOONLIGHT Blades to destroy it. The mission is at night so it will be hard to see the air fortress, but should find it pretty easy, especially after it fires missiles and lasers at you. On Hard, Do the same as on Normal difficulty, but would also recommend using some shouldermount Flares to distract the air fortress' missile attacks, than after you destroy the first air fortress, boost back to where you started the mission. Be careful because there will be 3 more air fortress's to destroy with the MOONLIGHT blades. Be careful and boost and dodge because you can be destroyed really quick if not careful.
Operation Ascend: Use the BurnMoon mech.
When the mission starts, switch to the OGOTO's and boost straight into the building and fly straight up. Once get to 1st gate, destroy it with the OGOTO's(shoot the middle of the gate to open quickly). Than proceed until all gates are blown open. On Hard, do the same as on Normal difficulty, but would again recommend the shouldermount Flares to help distract the missile attacks of the air fortress', than after the last gate is blown, there will be 3 air fortress's above you.Just switch to your MOONLIGHT blades and slash them on at a time to end the mission. Be careful of the ground lasers that can shoot you from below.
Line of Defense: Use the BurnOgoto mech.
When the mission starts, switch to the OGOTO's and proceed to destroy all enemy ground units. Than wait until 4 air unit appear, and destroy them also to finish the mission. On Hard, destroy the ground units. While doing so, an enemy NEXT will show up along with the 4 air units and an air fortress. Destroy the NEXT 1st, than proceed with the air units and air fortress. Just be careful of all the incoming missiles and lasers from the air fortress.
Sea of Blood: Use the BurnSirius mech.
When the mission starts, boost over to the top of the building and destroy the enemy Normals around you first, along with the fixed cannons from up high. Once done with the Normals and cannons, boost down to the water to destroy the enemy NEXT the Sirius cannons on your back. On hard, do the same as on Normal difficulty, but after you destroy the enemy NEXT, another enemy NEXT will show up. Destroy the 2nd NEXT quickly with the Sirius cannons to end the mission.
The Womb: Use the BurnOgoto mech.
When the mission starts, switch to the OGOTO's and proceed down the tuunels, destroying the enemies along the way. Proceed through the tunnels until you reach a big room with 3 NEXTS that have some type of expiremental sword weapons. Just destroy the 3 NEXTS with the OGOTO's while avoiding their attacks. On Hard, do the same as on Normal difficulty. There is no real difference between Hard and Normal for this mission.
Empress: Use the BurnSirius mech.
When the mission starts, switch to the Sirius cannons and than boost forward until find the enemy NEXT. Just destroy the NEXT with the Sirius cannons to finish the mission. On Hard, do the same as on Normal difficulty. There is no real difference between Hard and Normal for this mission.
Break the White Lance: Use the BurnOgoto mech.
When the mission starts, switch to the OGOTO's and proceed to boost and dodge like crazy through the fleets of ships until you reach the White Lance(only white ship in the entire fleet). Than just simply bomb the White Lance with the OGOTO's, one shot for each section of the boat(Back;middle;front) until it's destroyed. On Hard, it's the same as on Normal difficulty, but be careful and boost and dodge like no other until you reach the White Lance and than destroy with the OGOTO's.
Juggernaut: Use the BurnOgoto mech.
When the mission starts, switch to the OGOTO's and than move back a bit from start point. Wait until the train thing(the juggernaut) breaks through and once it does, start inloading OGOTO's on it while you also are boosting backwards. On Hard, do the same as on Normal diificulty.
The final mission of chapter 5 is “Bitter Obligation.” It is the mission 35th of the game.
Unseen Assailant: Use the BurnOgoto mech.
When the mission starts, proceed through tunnel till reach end than fall down to next tunnel a bit to the left. Proceed into next tunnel and shoot enemy at other end with the ER-0200 rifles and than go to next tunnel entrance to the right a bit. Once in next room, fly up a little and look left and destroy next target and go back down and into next tunnel. Once in next room, fly up till get to the next two targets than continue flying up till next tunnel. Once in next room, go to tunnel entrance that's just a bit left. Once in final room, destroy last target to finish the mission.. On Hard, it is the same as on Normal difficulty.
Hail of Bullets: Use the BurnOgoto mech.
When the mission starts, switch to the OGOTO's and than boost forward to first set of enemies on the landing strip in middle of water. Once destroyed, turn to the right and go to the next set of enemies on the second landing strip. Destroy them to finish the mission. On Hard, Do the same as on Normal difficulty, but after you destroy the second group, there will be 2 submarines and 2 ships out in the water that you need to destroy. Just use the OGOTO's to finsh them up.
Silent Avalanche: Use the BurnOgoto mech.
When the mission starts, switch to the OGOTO's and than boost to the left to destroythe first set of sniper Normals. Than continue to the next group(can follow there shots to get to them) and so on until all 3 groups are destroyed. On Hard, do the same as on Normal difficulty, but after you destroy the last group of enemies, 2 enemy NEXT's will show upto ruin the party. Just show them whose the boss with the OGOTO's and ER-0200's to finish up the mission.
Futile Resistance: Use the BurnOgoto mech.
When the mission starts, switch to the OGOTO's and proceed to destroy all enemy Normals in area until you reach the bottom where 4 more Normals will be. Destroy them to finish. Just be careful on this mission because the further down you go, the more damage you take from the chemicals in the atmosphere. So be quick about destroying the enemies. On Hard, it is the same as on Normal difficulty, but with a couple more enemies to destroy.
Pillar of Light: Use the BurnOgoto mech.
When the mission starts, switch to the OGOTO's and than boost like crazy while dodging incoming lasers and missiles and get under the structure to the right where enemies are firing from and blow the dome thats under it to lower's targets shield. Once done with dome and reach the target(big tall structure in middle of area). Destroy the cannons around the center structure. Once cannons are destroyed, use the Ogoto's to blow up the target. On Hard, it will be more difficult to reach the target because of more laser and missiles coming at you, but boost like crazy and do as you did on Normal difficulty to finish the mission.
Sol Dios: Use the BurnOgoto mech.
When the mission starts, switch to the OGOTO's and than boost forward until you get to the sol dios enemies. Once at the first group of them, fly around at a distance in front of the round part that shoots lasers. Once it starts to charge, blast it with the OGOTO's(use manual aiming by clicking and holding in the left thumbstick for a bit if needed). It should only take about 4 shots to destroy one. Once destroyed, move away quickly because their explosion is pretty big. On Hard, It's the same as on Normal difficulty, but you'll have to destroy one more group because WhiteGlint doesn't do his job.
Jardin De Chavalier: Use the BurnMoon mech.
When the mission starts, go forward to the door in front of you and start slashing at it right away. Doing this should kill the enemy NEXT before you even see it. If it don't happen, than switch to the OGOTO's and start blasting the NEXT. On Hard, it's the same as on Normal difficulty.
Marche Au Supplice: Use the BurnSirius or BurnOgoto mech.
When the mission starts, switch to either the Sirius or OGOTO's(whichever you choose) and than boost to the first enemy NEXTS and start firing away with your back weapons. Be sure to be quick and efficient with each NEXT. On hard, there will be no help with the NEXT's, but here's the way I did it. Not sure it it works all the time but is you stay neat the edge of the combat area where it says "Limit of Area" on the screen, stay there flying around because the NEXT's just flew around, away from me. Than came up one at a time as i got closer to them. Than use the OGOTO's or Sirius cannons along with the ER-0200 rifles to destroy the NEXT's one at a time. If that don't work for you, than just try to boost and dodge like crazt while blasting the NEXT's.
Bitter Obligations: Use the BurnOgoto mech.
When the mission starts, switch to the Ogoto cannons and proceed to blow up the metal pillars holding up the building. Once all the pillars are destroyed, get away from the building because it comes crashing down. On Hard, it will be difficult to shoot the pillars with the enemy NEXT shooting at you, so use the Ogoto cannons to destroy the NEXT first. Than proceed with the pillars, but be careful of the boats that also shoot at you.
The final mission of chapter 6 is “Seed a Barren Earth.” It is the 36th and final mission of the game.
Use the BurnSirius mech.
When the mission starts, switch to the Sirius cannons and proceed to shoot up the mysterious NEXT. Just boost and dodge it's fire power and it should be destroyed in no time. On Hard, do the same as on Normal difficulty, but after you destroy the mysterious NEXT, another enemy NEXT will show up. Just do the same to the second NEXT and you should be finished with the mission.
Just follow the Mission's guide above to help with getting this achievement. All you got to do is complete all 37 missions on Hard difficulty. Order does not matter. Remember, Hard is more than just stronger enemies, it means more enemies and more bosses.
See the achievement "Mission Rank SS" for videos on all the levels on Hard/S ranked.
Getting rank S doesn’t mean that you need all S ranks. Just mostly S rank. You can check your rank on the mission select screen. Remember, in order to get S you need mostly S rank and the rest can be A rank. So try for at least A rank on all levels before going for this one. Also you need to complete the Hard difficulty as well as Normal on S/A rank.
See the achievement Mission Rank SS for videos on all the levels on Hard/S ranked.
Awarded for completing the "SDGA RANK-A" data pack
Packs are unlocked by playing through the story and simulator and defeating certain enemies for their schematics. Collect 2 to 4 similar schematics and you unlock a pack and an achievement. For each pack the corresponding enemies that hold the schematics are listed as well as their number.
Defeat Primitive Light (No.10), Karyon (No.22), Kurumagakari (No.24).