Beat the game in Ironman mode on Classic or Impossible Difficulty.

Win a multiplayer match.

Mind Control an Ethereal. Single player only.

Beat the game on any difficulty.

Beat the game on Classic difficulty.

Beat the game on Impossible difficulty.

Clear a UFO crash site with one soldier on Classic or Impossible difficulty.

Kill 50 aliens with explosive weapons.

Kill 150 aliens.

Kill 500 aliens.

Shoot down 40 UFOs.

Have a soldier survive every mission in a full game.

Earn the "Excellent" rating in every performance category on a terror mission.

In a single game, complete every Research Project.

Kill an alien while flying. Single player only.

In a single game, complete every Autopsy.

Launch a Satellite.

Get satellite coverage over every country on one continent.

In a single game, shoot down one of each alien craft.

Build a suit of powered armor.

Play a multiplayer match against someone with this achievement.

Complete a mission without losing a soldier.

Advance one of your soldiers to Colonel rank.

Acquire 1000 credits in one month.

Staff the Research Labs with 80 scientists.

Staff the Engineering Department with 80 engineers.

In a single game, complete every Foundry project.

Build a S.H.I.V.

Build a Laboratory.

Build a Workshop.

Complete a Very Hard abduction mission in five turns or less on Classic or Impossible difficulty.

Win the game from each of the 5 starting locations.

Complete a Research Project.

Build a base facility.

Build an item.

Gain access to the lowest level in your base.

Fulfill a Council request.

Shoot down a UFO.

Complete the tutorial mission.

Win a mission with an all-female squad. Single player only.

Augment a soldier in single player

Modify a soldier in single player

Get a Soldier to have 5 modifications in single player

Deploy three tactical subsystems on a single soldier in single player

Deal with the newest global threat

Eliminate all alien waves

Eradicate the infestation

Beat the game without buying a Squad Size upgrade (Classic+ difficulty)

Field a fully enhanced squad and win the mission

Eliminate an enemy's shield and kill it on the same turn in single player

Kill a Muton Berserker in melee combat in single player

Stop a squad member from suffocating in single player

Make certain of the new threat's location

Jump two stories in one move in single player

Use Collateral Damage to blow up a car in single player

Field a squad with 4 augmented soldiers, each with a different base ability and win the mission

Field a squad consisting entirely of augmented soldiers and SHIVs (min. 4) and win the mission

Field a squad where all members have at least two modifications (min. 4) and win the mission

Kill an enemy as it is psionically attacking you in single player

Proc Combat Rush on the entire squad (min. 4)

Have your special-duty soldier kill three enemies in the same mission

Kill an elite enemy Sniper with one of your own snipers in single player

Kill an elite enemy Medic with explosive damage in single player

Kill an unseen enemy detected by a specially modified soldier in single player

Cause an enemy to suicide

Complete Deluge

Complete Furies

Beat a new special mission without losing any assets

Designate a highly decorated soldier as the Volunteer

Get at least 4 kills with XCOM Base Security personnel