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