Have a soldier survive every mission in a full game.
Shoot down 40 UFOs.
In a single game, complete every Research Project.
In a single game, shoot down one of each alien craft.
Kill 50 aliens with explosive weapons.
Mind Control an Ethereal. Single player only.
Kill 500 aliens.
Clear a UFO crash site with one soldier on Classic or Impossible difficulty.
Beat the game on Impossible difficulty.
Beat the game in Ironman mode on Classic or Impossible difficulty.
Beat the game on Classic difficulty.
Beat the game on any difficulty.
Make contact with the Ethereal hive mind.
Build the Gollop Chamber.
In a single game, complete every Autopsy.
Successfully assault an Overseer UFO.
Find a soldier with the Gift.
In a single game, complete every Foundry project.
Kill an alien while flying. Single player only.
Build a Firestorm.
Build a suit of powered armor.
Build the Hyperwave Relay.
Advance one of your soldiers to Colonel rank.
Kill 150 aliens.
Recover the Hyperwave Beacon.
Acquire 1000 credits in one month.
Earn the "Excellent" rating in every performance category on a terror mission.
Complete a Very Difficult abduction mission in five turns or less on Classic or Impossible difficulty.
Build a S.H.I.V
Uncover the alien base's location.
Stun an Outsider.
Fulfill a Council request.
Build a Workshop.
Get satellite coverage over every country on one continent.
Staff the Research Labs with 80 scientists.
Build a Laboratory.
Gain access to the lowest level in your base.
Capture a live alien.
Build a base facility.
Staff the Engineering Department with 80 engineers.
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.
Gain all trophies.
Win a multiplayer match.
Cure poison on five soldiers in a single mission. Single player only.
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.
