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