- Estimated achievement difficulty: 5/10
- Offline: 50 
- Online: 0
- Approximate amount of time to 1000: 15-20 Hours
- Minimum number of playthroughs needed: 1 [use code to unlock 1999 mode]
- Number of missable achievements: 2 ["Scavenger Hunt" and "Infused with Greatness"]. If you buy from a Dollar Bill vending machine during your 1999 playthrough, you will have to start the entire thing over. If you miss an Infusion, you will have to start from the chapter you missed it on and replay the game from that point making sure to continue to collect all of them. For other achievements, you can replay chapters and reload checkpoints to grind out kills, grab collectibles, etc. Chapter replay is extremely limited the way it works.
- Do cheat codes disable achievements? No, code to unlock 1999 mode is fine
- Does difficulty affect achievements? Yes, multiple difficulty achievements. They all stack, so start on 1999 mode after using the code described.
- Unobtainable/glitched achievements? None
- Extra equipment needed? No - Season Pass highly suggested before starting game.
DLC: Clash in the Clouds
- Difficulty: 5/10
- Time to 250: 10+ Hours
- Unobtainable: None
DLC: Burial at Sea, Episode 1
- Difficulty: 2/10
- Time to 250: 2+ Hours
- Unobtainable: None
DLC: Burial at Sea: Episode 2
- Difficulty: 4/10
- Time to 50: 4+ Hours
- Unobtainable: None
This is a first person shooter that gives you powers in one hand, and guns in the other. You do not have to have played other Bioshock games in order to follow the story. The game does have stacking difficulties, so put in the code to unlock 1999 mode and start from there. I highly suggest you purchase the season pass (Season Pass Store in game menu) in order to get a really great head start as an equipment piece that is one of the best in the game. Make sure you are following one of the many collectible guides in order to gain everything. There is chapter replay, so you can always start somewhere. The items/weapons/money you had at the check point is what you start with, however. This is why Infused with Greatness is missable. Collecting the infusions will just reset when you go to the one you missed, therefore making you play the entire game from that point over again. This is why it's extremely important to get the Season Pass, so that you can miss a total of 5 and still be good. The check points seem far away from each other, so reload only when it will benefit you the most. You can reload check points shortly after gaining them to grind out kills with various weapons or to gain other types of achievements that require certain amounts If you quit without hitting a check point your progress will be lost.
If you want to prepare, please visit THIS THREAD for useful links to help you out.
Playthrough 1999 Mode:
WARNING: During this mode, do not purchase anything from the Dollar Bill vending machines or you will have to play the entire game over again. These machines have ammo, salt, and health to purchase. You can enter them by accident, just do not purchase anything. If you do, reload your check point (hopefully that will work).
First things first, enter the button sequence at the main menu to unlock the hardest difficulty. Now go purchase the Season Pass if you have not already. This is not required, but it will make things much easier for you. While this mode is the most difficult, it is not as bad as one might think. At first without powers and only a pistol, you will feel like the game is going to be extreme. Once you start getting certain equipment, powers, and upgrades, you will be able to do fine. Specifically, after gaining Elizabeth, you will be thrown ammo, Salts, and even money.
Only upgrade the Carbine Rifle completely as well as Bucking Bronco and Charge once obtained. This will allow you to have all of your money available upon death. Once you die, you spend $100 to be revived. You can do other upgrades if you'd like. You may end the game with around $4,000 if you only upgraded what I suggested and died a few times here and there. If you read the description for 1999 Mode, I have given the perfect build to be extremely hard to kill and always have Salt/Ammo/Health. It's a melee build and it works beautifully.
Also, as far as Infusion upgrades, be sure to put most of it into health. Shields break extremely easily and upgrading them doesn't give you much more of it.
If for some reason you have failed at collecting everything or gaining certain achievements, go ahead and pick a chapter to reload and gain what you need. If you really enjoyed the game, start another playthrough on Easy to focus on what you have missed. After playing 1999 mode, you will find it laughable.
Clash in the Clouds DLC
This is a standalone DLC which means none of your progress, money, upgrades, etc shows up in it. You must earn money and complete waves to get all of your progress back. The good news is that you can keep farming the money by completing the same waves and challenges. You are automatically put on the hard difficulty and cannot change it. If you die in a wave you can just jump right back in, but you will fail the current challenge and forfeit leaderboard rankings (if that's even important to you).
Step 1: Complete all Waves
Go ahead and play through all the waves in each level. There are 15 waves in 4 levels, each wave having specific challenges. Complete the challenges when you can, but don't worry if you fail them. Once you have completed all the waves on all levels, you will have a lot of money to purchase upgrades and earn gear. This will allow you to attempt and concentrate on them later, when you're a whole lot tougher.
Step 2: Completing all Challenges
Once you are upgraded enough, you can try the challenges you do not have. To see the ones you have, look below the painting on each level. There will be a spot with the blue ribbons on it. You can tell what ones you have missed, because there won't be a ribbon there. They are in rows of 5. Go ahead and complete them, using a guide found in the Blue Ribbon Champ achievement details. This will likely take you a long time, as if you die or fail a challenge, you will have to start from the first wave again.
Step 3: Misc Achievements
There are only a few of these. Killing enemies with all weapons and vigors (except Bucking Bronco) should be easy if you keep track. Doing all combos and landing the kill should be easy after upgrading the vigors. For that you should see the achievement details for a list of the combos. You also must use undertow to knock an enemy off the map, catch him, then hit him again.
Step 4: Unlocking Gallery Items
As you complete all waves, unlock all ribbons, and collect all other misc achievements, you can focus on purchasing everything in the Gallery.
Burial at Sea, Episode 1 DLC
Episode 1 of the Burial At Sea DLC is fairly short. It can be completed in around 2 hours, depending on how much you want to explore. There are three story related achievements that will unlock just for completing the story.
The DLC introduces a new plasmid, Old Man Winter, and a powerful new weapon, the Radar Range. There are 2 achievements each for killing enemies using the new equipment. They're fairly easy to unlock through normal combat. There's also a few miscellaneous achievements, such as 'Confirmed Luddite' which is for destroying 10 turrets.
The short length combined with the ability to reload checkpoints/chapters make it hard to miss any of the achievements. The only part where you might have some difficulty is finding all the audio diaries. If you've gotten the voxophones in the main game, it's pretty much par for the course and you'll know what to expect. Be sure to save your money for "Fully Equipped". If you spend all your money on other upgrades and items, you might find yourself having to replay a bigger chunk of the game in order to earn enough money for the upgrades.
There is nothing related to difficulty, so set it to easy difficulty to breeze through it. Once you're done, look forward to seeing Episode 2!
Burial at Sea: Episode 2 DLC
After a long wait, Episode 2 is finally here! In the depths of the glorious city of the sea, Bioshock Infinite: Burial at Sea Episode 2 is presented once again in Rapture. This picks up from Episode 1 where the player is now in the role of Elizabeth as she explores Rapture during it's fall.
The DLC introduces new weapons and equipment; the Crossbow, Lock Picks (to interact with and unlock doors and safes), and new Vigors; Peeping Tom (invisibility lets you see through walls as well) and Ironside (enemy shoots you, acts like a shield and fills up your ammo). The other Vigors are Possession (possess enemies) and Old Man Winter (freezes enemies or makes traps). There are collectibles again for Audio Diaries and Voxophones see "The Whole Story".
Introducing a new mode combining stealth mode and hard mode together. This mode is to get people to play in a stealthier way. There is an achievement for the game in this mode called "Taffers Delight" which refers to the original Thief game which makes you play the story in stealth because your health is very low. Although this mode isn’t too challenging, it doesn’t give a whole lot of ammo or money. In this mode you only get the crossbow and plasmids. Finding different ways to take enemies out and saving crossbows when you needed is important. It is possible to go throughout the whole game not killing anyone. I suggest you play on Normal mode first to get the feel of the game and know where to go because in 1998 mode it does not tell you where to go; no for directions. See "Taffers Delight" for more details.
Credit: bs000, JuSt BLaZe, XboxAchievements Community, All Youtube Videos Used
All in all, the game is beautiful, fun, and has a deep story. The achievements are very nicely planned out. The only thing that could have been done better was collectible tracking and the ability to replay chapters with your current powers/upgrades. That or a true new game+ that let you carry over everything. Would have just been nice to upgrade everything to fully appreciate everything that the game had to offer.
[x360a would like to thank Tyger7 for this Roadmap]
[x360a would like to thank Tyger7 for the Clash in the Clouds DLC Roadmap]
[x360a would like to thank bs000 for the Burial at Sea, Part 1 DLC Roadmap]
[x360a would like to thank MissJaded for the Burial at Sea, Part 2 DLC Roadmap]