| Achievement | How to unlock
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| ...and Practice | Build a Workshop.
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| A Continental Fellow | Win the game from each of the 5 starting locations.
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| A Little Bit Alien | Modify a soldier in single player.
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| Ain't No Cavalry Comin' | Have a soldier survive every mission in a full game.
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| All Hands On Deck | Get at least 4 kills with XCOM Base Security personnel.
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| All Together Now | Get satellite coverage over every country on one continent.
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| An Army Of Four | Beat the game without buying a Squad Size upgrade (Classic+ difficulty).
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| And Hell's Coming With Me | Successfully assault an Overseer UFO.
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| And So It Begins... | Complete the tutorial mission.
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| Angel of Death | Kill an alien while flying. Single player only.
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| Anger Management | Proc Combat Rush on the entire squad (min. 4).
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| Apotheosis Denied | Deal with the newest global threat.
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| As A Scalpel | Earn "Excellent" rating in every category on a terror mission.
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| Bada Boom | Kill 50 aliens with explosive weapons.
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| Beyond the Veil | Find a soldier with the Gift.
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| By Our Powers Combined | Field a squad with 4 augmented soldiers, each with a different base ability and win the mission.
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| Combat Ready | Build an item.
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| Drums in the Deep | Gain access to the lowest level in your base.
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| Earth First | Beat the game on Classic difficulty.
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| Edison | In a single game, complete every Research Project.
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| Elite Defense | Beat a new special mission without losing any assets.
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| Employees Must Wash Hands | In a single game, complete every Autopsy.
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| Enemy Within | Get a Soldier to have 5 modifications in single player.
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| Eye in the Sky | Launch a Satellite.
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| Flight of the Valkyries | Win a mission with an all-female squad. Single player only.
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| G'day | Kill an elite enemy Sniper with one of your own snipers in single player.
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| Guardian of Earth | Designate a highly decorated soldier as the Volunteer.
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| Happy to Oblige | Fulfill a Council request.
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| Humanity's Savior | Beat the game on any difficulty.
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| Hunter/Killer | In a single game, shoot down one of each alien craft.
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| Lone Wolf | Clear a UFO crash site with one soldier on Classic or Impossible.
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| Man No More | Build a suit of powered armor.
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| Meet New People. Kill Them! | Win a multiplayer match.
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| Mental Minefield | Kill an enemy as it is psionically attacking you in single player.
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| Mind the Step | Jump two stories in one move in single player.
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| Mutatis Mutandis | Field a squad where all members have at least two modifications (min. 4) and win the mission.
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| Nice Cover | Use Collateral Damage to blow up a car in single player.
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| No Looking Back | Beat the game in Ironman mode on Classic or Impossible Difficulty.
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| Off My Planet | Recover the Hyperwave Beacon.
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| On the Shoulders of Giants | Build the Gollop Chamber.
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| One Gun at a Time | Staff the Engineering Department with 80 engineers.
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| Oppenheimer | Staff the Research Labs with 80 scientists.
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| Our Finest Hour | Beat the game on Impossible difficulty.
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| Pain in the Neck | Cause an enemy to suicide.
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| Pale Horse | Kill 500 aliens.
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| Prisoner of War | Capture a live alien.
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| Regenerate This | Kill an elite enemy Medic with explosive damage in single player.
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| Remington... Max Remington | Have your special-duty soldier kill three enemies in the same mission.
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| Ride the Lightning | Build a Firestorm.
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| Rise of the Machines | Field a squad consisting entirely of augmented soldiers and SHIVs (min. 4) and win the mission.
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| See All, Know All | Build the Hyperwave Relay.
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| Shieldbuster | Eliminate an enemy's shield and kill it on the same turn in single player.
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| Shooting Stars | Shoot down 40 UFOs.
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| Skunkworks | In a single game, complete every Foundry project.
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| Someone Your Own Size | Kill a Muton Berserker in melee combat in single player.
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| Steel Martyr | Deploy three tactical subsystems on a single soldier in single player.
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| Tables Turned | Shoot down a UFO.
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| Taking A Load Off | Stop a squad member from suffocating in single player.
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| The Gatekeeper | Stun an Outsider.
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| The Hardest Road | Advance one of your soldiers to Colonel rank.
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| The Meld Squad | Field a fully enhanced squad and win the mission.
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| The Volunteer | Make contact with the Ethereal hive mind.
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| Theory... | Build a Laboratory.
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| They Shall Not Pass | Eliminate all alien waves.
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| Tingling Sensation | Kill an unseen enemy detected by a specially modified soldier in single player.
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| Up and Running | Build a base facility.
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| We Happy Few | Complete a mission without losing a soldier.
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| Welcoming Committee | Kill 150 aliens.
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| Wet Work | Win a v. Hard abduction within 5 turns on Classic or Impossible.
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| What Wonders Await | Complete a Research Project.
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| Where in the World | Make certain of the new threat's location.
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| Who Needs Limbs? | Augment a soldier in single player.
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| Worth Every Penny | Acquire 1000 credits in one month.
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| X Marks the Spot | Uncover the alien base's location.
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| Xavier | Mind Control an Ethereal. Single player only.
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| You Have 5 Seconds to Comply | Build a S.H.I.V.
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| Zom-B-Gone | Eradicate the infestation.
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