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