| Achievement | How to unlock
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| - Advance a Medic to level 10.
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| - Kill an enemy before they detect the squad.
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- Chalk It Up To Experience
| - Have a marine with at least two Prostheses.
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- Cleaning Lethe, One Nest At A Time
| - During a campaign, kill hundred Xenomorphs.
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| - Kill an enemy by using an explosive barrel.
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- Come on, You Wanna Live Forever?
| - Advance a Sergeant to level 10.
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- Damn Dude, You Gotta Lose Some Weight!
| - Secure an unconscious marine.
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| - Advance a Gunner to level 10.
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| - Keep all of your marines alive during a campaign.
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| - Advance a Recon to level 10.
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- Hardened In The Heat Of Battle
| - During a campaign, advance each Marine Class to level 10.
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| - Lure a Queen into a Mine.
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| - Kill every Alien of a Massive Onslaught.
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| - Destroy four eggs with one grenade or an RPG shot.
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| - During a campaign, unlock every weapon.
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| - During a campaign, secure five survivors.
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| - During a campaign, unlock every Xeno Tech.
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| - Finish the game on "No One Can Hear Them Scream" mode.
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| - Have one Sentry kill at least ten aliens.
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| - Kill every Queen during a campaign.
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| - Prevent a marine from being Abducted.
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- Something Lurks Under The Hills
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| - Save a Marine from being incubated.
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| - Advance a Tecker to level 10.
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| - Remove a Trait from a marine.
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| - In any mission, complete at least one objective with only one marine in the squad.
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| - Finish the game on Nightmare.
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- This Is Hayes, Pioneer Station, Signing Off
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| - Save a marine from dying of Bleeding.
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| - Finish the game on Medium.
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- Use The Bumper, That's What It's For
| - Make the ARC/APC run over an enemy.
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