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