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