Beat the game on any difficulty.
Make contact with the Ethereal hive mind.
Build the Gollop Chamber.
In a single game, complete every Foundry project.
In a single game, complete every Autopsy.
Successfully assault an Overseer UFO.
Earn the "Excellent" rating in every performance category on a terror mission.
Find a soldier with the Gift.
Staff the Research Labs with 80 scientists.
Build the Hyperwave Relay.
Recover the Hyperwave Beacon.
Staff the Engineering Department with 80 engineers.
Kill an alien while flying. Single player only.
Build a Firestorm.
Acquire 1000 credits in one month.
Build a S.H.I.V
Cure poison on five soldiers in a single mission. Single player only.
Kill 500 aliens.
Uncover the alien base's location.
Stun an Outsider.
Advance one of your soldiers to Colonel rank.
Gain access to the lowest level in your base.
Build a suit of powered armor.
Build a Workshop.
Capture a live alien.
Kill 50 aliens with explosive weapons.
Get satellite coverage over every country on one continent.
Complete the tutorial mission.
Kill 150 aliens.
Win a multiplayer match.
Fulfill a Council request.
Launch a Satellite.
Build a Laboratory.
Build an item.
Shoot down a UFO.
Build a base facility.
Complete a Research Project.
Complete a mission without losing a soldier.
Gain all trophies.
Beat the game in Ironman mode on Classic or Impossible difficulty.
Mind Control an Ethereal. Single player only.
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.
In a single game, complete every Research Project.
In a single game, shoot down one of each alien craft.
Complete a Very Difficult abduction mission in five turns or less on Classic or Impossible difficulty.
Win the game from each of the 5 starting locations.
Win a mission with an all-female squad. Single player only.
Complete Friends in Low Places.
Complete Confounding Light.
Complete Gangplank.
Take your new ally into the final challenge.
Complete Confounding Light with more than 3 turns left on the timer.
