- Estimated achievement difficulty: 3/10 [Achievement Difficulty Rating]
- Offline: 9 
- Online: 0
- Approximate amount of time to 0: 5-8 hours [Estimated Time to 100%]
- Minimum number of playthroughs needed: 1
- Missable achievements: None
- Does difficulty affect achievements: No
- Unobtainable/glitched achievements: No
Thanks to 'StrategyWiki.com' for a detailed written walkthrough of each level.
Thanks to 'WithPCGame' and 'revenant0519' for comprehensive video walkthroughs (LINK and LINK).
"Shortly after landing on an alien surface, you learn that hundreds of your men have been reduced to just a few. Now you must fight your way through heavily fortified military installations, lower the city's defenses and shut down the enemy's war machine. Only then will the fate of humanity be known."
So sets the tone for Quake II. In this game, you take on the role of a Marine named Bitterman. You are a part of a military campaign called "Operation Alien Overlord", which is a massive preemptive strike against the planet Stroggos, the homeworld of the alien race known as the Strogg, who are planning to invade and take over Earth and subjugating its inhabitants. Upon crashing on Stroggos, you find yourself alone and miles from your objective. You are tasked with reestablishing communications, destroying their planetary defenses and disabling the interplanetary gateway which they will use to launch an attack on Earth. With those completed, there’s only one thing left to do, neutralize the Strogg leader, the Makrov.
This game was only released as part of a bonus disc in the original Activision Quake 4 release in 2005 (there was a second release by Bethesda in 2012 that did not include the bonus disc). The Activision release contained a Quake II cheat sheet, detailing the controls and basic elements of the game. If you no longer have this sheet (or never had it), here are the controls in the game.
- Jump/Up (Swim)
- Previous Weapon
- Next Weapon
- Help Computer (Location, Objectives, Enemies Killed, Goals Completed, Secrets Found)
- Run/Swim Faster
- Walk/Crouch/Down (Swim)
/ - Menu
- Previous Inventory Item
- Next Inventory Item
- Use Item
First off, while there is local and System Link co-op and multiplayer, to unlock the achievements, you must play through the single-player game solo.
You can save at any point in the game; just press or , select 'Game' and press , then navigate to 'Save Game' and press again, select a slot and press once again. It is recommended you save often, because if you die and you haven’t saved, you revert back to the beginning of the level you were playing.
This is an "old school" shooter, meaning that there's no regenerating health (you have to use health packs), no reloading your weapon (you can shoot until you run out of ammo) and no waypoint/objective markers. There is also no melee, aiming down sights or in-game map, which were not common game mechanics in first-person shooters when this game originally came out in 1997. No markers or map make it kind of difficult at times because often you’re wandering around aimlessly looking for an open area that was previously closed off.
Each group of levels is called a 'Unit' and consists of one to six levels each. There are individual 39 levels total. You will be backtracking back and forth between the Unit levels a number of times in order to complete objectives and gather items before moving on to the next Unit. Completing each Unit unlocks an achievement.
It is recommended that you save any one-time use power-ups collected for the stronger enemies in later levels (like Quad Damage and Invulnerability). Other items that are useful are the Bandolier (first found in the 'Detention Center' in Unit 3; increases your Bullet, Shell and Grenade capacity) and the Ammo Pack (first found in the 'Guard House' in Unit 3, increases everything the Bandolier does along with Rocket, Slug and Cell capacity). Picking up either of these also replenishes some of your ammunition.
Every achievement is story-related, so it’s just a matter of playing through the entire game to unlock them all. And since there are no difficulty achievements, you can play on Easy and still get them all. Even on Easy, you still need to be careful as you can die very quickly if you’re not paying attention.
Although there is no gamerscore for these achievements, this is still one of the more enjoyable first-person shooters you can play. With Quake 4 being a direct sequel to this game (Quake 1 had a different setting altogether and Quake III Arena/Team Arena was multiplayer only), it was good of Activision to include this in the package so you could play the entire Strogg story. And while it is unfortunate that this didn’t include either mission pack (they weren’t originally published by Activision and therefore couldn’t include them), this is still a nice addition.
[XBA would like to thank bLaKgRaVy for this Roadmap]