| Achievement | How to unlock
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| - Rescue a teammate from a Close Encounter
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| - Upgrade every Appearance slot once for a Xenomorph class
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| - Kill a Crusher without it damaging you
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- Bad Feeling About This Drop
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| - Kill a Xenomorph climbing on the walls or ceiling
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- Distinguished Service Medal
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| - Kill a Xenomorph with a shotgun at very close range
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| - Kill 10 Xenomorphs that are using vents
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- Field Modified, Kill Certified
| - Upgrade every slot for a weapon
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| - Arm the emergency release and escape in under 2:30 on Sulaco Falls
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| - Complete all Campaign levels on any difficulty
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| - Defeat the Raven in under 1:10 on Soldier difficulty or higher
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| - Purchase all Upgrades for a weapon
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| - 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
| - Collect all 6 Legendary Weapons
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| - Kill 3 enemies with a single U4 Firebomb
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| - Complete Hope in Hadley's
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| - Kill 10 Xenomorphs in a game with the M56A2 Smart Gun
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| - Survive a Close Encounter with a Facehugger
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- Micro Changes in Air Density
| - Track 100 hostile targets with the Motion Tracker
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| - Set up a UA 571-C Remote Sentry
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| - Complete One Bullet without setting off the alarm
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| - Melee a Lurker that is pouncing towards you
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| - Complete all Campaign levels on Hardened difficulty
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| - Upgrade every Loadout slot for a Xenomorph class
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| - Collect a Legendary Weapon
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| - Kill 5 Spitters without being damaged by acid
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| - Defeat all Xenomorphs in the Sulaco hanger bay without them crossing your barricade
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| - Complete all Campaign levels on Ultimate Badass difficulty
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| - Complete an entire Challenge category
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- You Look Just Like I Feel
| - Upgrade every Appearance slot once for your Marine
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