Kill 500 aliens.
Build a Workshop.
Acquire 1000 credits in one month.
Get satellite coverage over every country on one continent.
Build a S.H.I.V.
Kill 50 aliens with explosive weapons.
Advance one of your soldiers to Colonel rank.
Kill 150 aliens.
Fulfill a Council request.
Build a base facility.
Shoot down a UFO.
Launch a Satellite.
Build an item.
Complete a Research Project.
Complete a mission without losing a soldier.
Complete the tutorial mission.
Field a fully enhanced squad and win the mission
Eliminate an enemy's shield and kill it on the same turn in single player
Beat the game in Ironman mode on Classic or Impossible Difficulty.
Beat the game without buying a Squad Size upgrade (Classic+ difficulty)
Eradicate the infestation
Eliminate all alien waves
Deal with the newest global threat
Deploy three tactical subsystems on a single soldier in single player
Get a Soldier to have 5 modifications in single player
Kill a Muton Berserker in melee combat in single player
Field a squad with 4 augmented soldiers, each with a different base ability and win the mission
Stop a squad member from suffocating in single player
Kill an elite enemy Sniper with one of your own snipers in single player
Designate a highly decorated soldier as the Volunteer
Beat a new special mission without losing any assets
Complete Furies
Complete Deluge
Cause an enemy to suicide
Kill an unseen enemy detected by a specially modified soldier in single player
Kill an elite enemy Medic with explosive damage in single player
Have your special-duty soldier kill three enemies in the same mission
Make certain of the new threat's location
Proc Combat Rush on the entire squad (min. 4)
Kill an enemy as it is psionically attacking you in single player
Field a squad where all members have at least two modifications (min. 4) and win the mission
Field a squad consisting entirely of augmented soldiers and SHIVs (min. 4) and win the mission
Augment a soldier in single player
Use Collateral Damage to blow up a car in single player
Jump two stories in one move in single player
Modify a soldier in single player
Gain access to the lowest level in your base.
Build a suit of powered armor.
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.
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.
In a single game, shoot down one of each alien craft.
Play a multiplayer match against someone with this achievement.
Staff the Research Labs with 80 scientists.
Staff the Engineering Department with 80 engineers.
In a single game, complete every Foundry project.
Build a Laboratory.
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.
Win a multiplayer match.
Win a mission with an all-female squad. Single player only.
Get at least 4 kills with XCOM Base Security personnel
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