Complete the following achievements to unlock Xbox Live Gamerscore points.
| Achievement | How to unlock | 
|---|
| ... But No Cigar (20 points)
 | Rescue a teammate from a Close Encounter. 
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| Adaptive Morphology (30 points)
 | Upgrade every Appearance slot once for a Xenomorph class. 
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| Adios, Muchachos (20 points)
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| Another Bug Hunt (5 points)
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| Another Day in the Corps! (20 points)
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| Anytime, Anywhere (20 points)
 | Kill a Crusher without it damaging you. 
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| Arbitrarily Exterminated (30 points)
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| Bad Feeling About This Drop (20 points)
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| Coming Outta the Walls! (10 points)
 | Kill a Xenomorph climbing on the walls or ceiling. 
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| Distinguished Service Medal (30 points)
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| Don't Count Me Out (5 points)
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| Dragged Queen (20 points)
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|  | Kill a Xenomorph with a shotgun at very close range. 
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| Entry Prohibited (20 points)
 | Kill 10 Xenomorphs that are using vents. 
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| Field Modified, Kill Certified (20 points)
 | Upgrade every slot for a weapon. 
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| Field Promotion (10 points)
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|  | Arm the emergency release and escape in under 2:30 on Sulaco Falls. 
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| Game Over, Man! (30 points)
 | Complete all Campaign levels on any difficulty. 
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| Heavy Lifting (20 points)
 | Defeat the Raven in under 1:10 on Soldier difficulty or higher. 
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| I Can Handle Myself (40 points)
 | Purchase all Upgrades for a weapon. 
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| I Feel Safer Already (10 points)
 | Have another player join your party. 
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|  | Collect all 12 Audio Logs. 
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| I Like to Keep These Handy (30 points)
 | Collect all 6 Legendary Weapons. 
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| I Love the Corps! (40 points)
 | Earn Rank 60 as a Marine. 
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| It's a Dry Heat (20 points)
 | Kill 3 enemies with a single U4 Firebomb. 
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|  | Complete Hope in Hadley's. 
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| Lean and Mean (20 points)
 | Earn Rank 20 as a Marine. 
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|  | Kill 10 Xenomorphs in a game with the M56A2 Smart Gun. 
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| Love at First Sight (10 points)
 | Survive a Close Encounter with a Facehugger. 
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| Majority Shareholder (25 points)
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| Micro Changes in Air Density (10 points)
 | Track 100 hostile targets with the Motion Tracker. 
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| Mostly Come at Night... (20 points)
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| Need a Deck Of Cards? (5 points)
 | Set up a UA 571-C Remote Sentry. 
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| No Need For Alarm (20 points)
 | Complete One Bullet without setting off the alarm. 
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|  | Melee a Lurker that is pouncing towards you. 
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| Not Bad For a Human (40 points)
 | Complete all Campaign levels on Hardened difficulty. 
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| Oorah to Ashes (10 points)
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| Perfect Killing Machine (20 points)
 | Upgrade every Loadout slot for a Xenomorph class. 
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| Personal Friend of Mine (10 points)
 | Collect a Legendary Weapon. 
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| Quoth the Raven (20 points)
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| Ready to Fry Half a City (5 points)
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| Remember the Fallen (30 points)
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| Secreted from What? (20 points)
 | Kill 5 Spitters without being damaged by acid. 
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| Short, Controlled Bursts (20 points)
 | Defeat all Xenomorphs in the Sulaco hangar bay without them crossing your barricade. 
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| State of the Badass Art (50 points)
 | Complete all Campaign levels on Ultimate Badass difficulty. 
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|  | Complete an entire Challenge category. 
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| Still Got a Job to Do (20 points)
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| Structural Perfection (5 points)
 | Edit a Xenomorph Loadout. 
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| You Look Just Like I Feel (30 points)
 | Upgrade every Appearance slot once for your Marine. 
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