| Achievement | How to unlock
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| Abysmal Horrors | Complete Mission 12.
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| Archivist | Gather all datapads.
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| Bandage Lover | Advance a Medic to level 10.
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| Call Me Snake | 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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| Colonial Barrels | 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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| Deep Into Insanity | Complete Mission 08.
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| El Riesgo Siempre Vive | Advance a Gunner to level 10.
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| Excavating The Truth | Complete Mission 11.
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| Fair And Square | Finish the game on Hard.
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| First Steps Into Madness | Complete Mission 02.
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| Flawless Victory | Keep all of your marines alive during a campaign.
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| Frontliner | 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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| Harper's Hell | Complete Mission 03.
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| Heavy Steps | Lure a Queen into a Mine.
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| Keep 'Em Coming | Kill every Alien of a Massive Onslaught.
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| Living Nightmare | Complete Mission 06.
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| Making a Stand | Complete Mission 04.
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| Omelette Du Fromage | Destroy four eggs with one grenade or an RPG shot.
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| One For Every Occasion | During a campaign, unlock every weapon.
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| People Person | During a campaign, secure five survivors.
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| Perfect Enhancements | During a campaign, unlock every Xeno Tech.
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| Perfect Organism | Finish the game on "No One Can Hear Them Scream" mode.
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| Recouped Investment | Have one Sentry kill at least ten aliens.
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| Regicide | Kill every Queen during a campaign.
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| Snatched Out | Prevent a marine from being Abducted.
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| Something Lurks Under The Hills | Complete Mission 01.
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| Stuff Of Nightmares | Save a Marine from being incubated.
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| The Cable Guy | Advance a Tecker to level 10.
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| The Darwin Era Was Here | Complete Mission 07.
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| The More The Merrier | Unlock the APC.
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| The Passenger | Complete Mission 09.
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| The Shrink Hates Me | Remove a Trait from a marine.
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| The Spire | Complete Mission 10.
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| The True Experience | In any mission, complete at least one objective with only one marine in the squad.
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| This Ain't No Picnic | Finish the game on Nightmare.
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| This Is Hayes, Pioneer Station, Signing Off | Finish the Prologue.
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| This Was No Papercut | Save a marine from dying of Bleeding.
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| This Went Smoothly | 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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| Where It All Begun | Complete Mission 05.
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