Complete the indicated task to unlock the achievement.

Achievement	How to unlock
... But No Cigar	Rescue a teammate from a Close Encounter
Adaptive Morphology	Upgrade every Appearance slot once for a Xenomorph class
Adios, Muchachos	Gib two enemies at once
Another Bug Hunt	Complete a Challenge
Another Day in the Corps	Complete Distress
Anytime, Anywhere	Kill a Crusher without it damaging you
Arbitrarily Exterminated	Kill 2179 Xenomorphs
Bad Feeling About This Drop	Complete Sulaco Falls
Coming Outta the Walls!	Kill a Xenomorph climbing on the walls or ceiling
Distinguished Service Medal	Complete all Challenges
Don't Count Me Out	Revive a teammate
Dragged Queen	Complete Home
Easter Egg	Find the Easter Egg
Eat This!	Kill a Xenomorph with a shotgun at very close range
Entry Prohibited	Kill 10 Xenomorphs that are using vents
Field Modified, Kill Certified	Upgrade every slot for a weapon
Field Promotion	Earn Rank 2 as a Marine
Fire Drill	Arm the emergency release and escape in under 2:30 on Sulaco Falls
Game Over, Man!	Complete all Campaign levels on any difficulty
Heavy Lifting	Defeat the Raven in under 1:10 on Soldier difficulty or higher
I Can Handle Myself	Purchase all Upgrades for a weapon
I Feel Safer Already	Have another player join your party
I Heard THAT	Collect all 12 Audio Logs
I Like to Keep These Handy	Collect all 6 Legendary Weapons
I Love the Corps!	Earn Rank 60 as a Marine
It's a Dry Heat	Kill 3 enemies with a single U4 Firebomb
Just a Grunt	Complete Hope in Hadley's
Lean and Mean	Earn Rank 20 as a Marine
Let's Rock!	Kill 10 Xenomorphs in a game with the M56A2 Smart Gun
Love at First Sight	Survive a Close Encounter with a Facehugger
Majority Shareholder	Spend 30 Commendations
Micro Changes in Air Density	Track 100 hostile targets with the Motion Tracker
Mostly Come at Night	Find Newt's doll
Need a Deck Of Cards?	Set up a UA 571-C Remote Sentry
No Need For Alarm	Complete One Bullet without setting off the alarm
No Offense	Melee a Lurker that is pouncing towards you
Not Bad For a Human	Complete all Campaign levels on Hardened difficulty
Oorah to Ashes	Collect a Dog Tag
Perfect Killing Machine	Upgrade every Loadout slot for a Xenomorph class
Personal Friend of Mine	Collect a Legendary Weapon
Quoth the Raven	Complete The Raven
Ready to Fry Half a City	Edit a Marine Loadout
Remember the Fallen	Collect all 35 Dog Tags
Secreted from What?	Kill 5 Spitters without being damaged by acid
Short, Controlled Bursts	Defeat all Xenomorphs in the Sulaco hanger bay without them crossing your barricade
State of the Badass Art	Complete all Campaign levels on Ultimate Badass difficulty
Stay Frosty	Complete an entire Challenge category
Still Got a Job to Do	Complete Rampart
Structural Perfection	Edit a Xenomorph Loadout
You Look Just Like I Feel	Upgrade every Appearance slot once for your Marine