Full list of all 60 Aliens: Colonial Marines achievements worth 1,250 gamerscore.
The base game contains 50 achievements worth 1,000 Gamerscore, and there is 1 DLC pack containing 10 achievements worth 250 Gamerscore.
Earn Rank 60 as a Marine
Complete all Challenges
Kill 2179 Xenomorphs
Spend 30 Commendations
Upgrade every Appearance slot once for your Marine
Kill 3 enemies with a single U4 Firebomb
Upgrade every Appearance slot once for a Xenomorph class
Complete an entire Challenge category
Melee a Lurker that is pouncing towards you
Upgrade every Loadout slot for a Xenomorph class
Gib two enemies at once
Defeat the Raven in under 1:10 on Soldier difficulty or higher
Kill a Crusher without it damaging you
Find Newt's doll
Arm the emergency release and escape in under 2:30 on Sulaco Falls
Find the Easter Egg
Defeat all Xenomorphs in the Sulaco hangar bay without them crossing your barricade
Edit a Xenomorph Loadout
Survive a Close Encounter with a Facehugger
Collect all 12 Audio Logs
Kill 5 Spitters without being damaged by acid
Collect all 35 Dog Tags
Kill 10 Xenomorphs in a game with the M56A2 Smart Gun
Complete all Campaign levels on any difficulty
Complete all Campaign levels on Hardened difficulty
Complete all Campaign levels on Ultimate Badass difficulty
Complete Home
Upgrade every slot for a weapon
Purchase all Upgrades for a weapon
Collect all 6 Legendary Weapons
Track 100 hostile targets with the Motion Tracker
Complete Hope in Hadley's
Kill 10 Xenomorphs that are using vents
Complete Rampart
Have another player join your party
Complete One Bullet without setting off the alarm
Earn Rank 20 as a Marine
Complete The Raven
Kill a Xenomorph climbing on the walls or ceiling
Complete Sulaco Falls
Edit a Marine Loadout
Rescue a teammate from a Close Encounter
Complete Distress
Complete a Challenge
Collect a Legendary Weapon
Kill a Xenomorph with a shotgun at very close range
Collect a Dog Tag
Earn Rank 2 as a Marine
Revive a teammate
Set up a UA 571-C Remote Sentry
Complete Stasis Interrupted on Ultimate Badass
Complete Stasis Interrupted on any difficulty
Find All Stasis Interrupted Audio Logs
Destroy all samples in the labs of the Queen module
Survive the Queen escape
Escape the FTL ship
Kill all the Lurkers in Sulaco engineering
Sever the umbilical without missing a shot
Destroy the Legato
Find your family