Beat the game in Ironman mode on Classic or Impossible difficulty.
Win the game from each of the 5 starting locations.
Beat the game on Impossible difficulty.
Win a multiplayer match.
Beat the game on Classic difficulty.
Complete a Very Hard abduction mission in five turns or less on Classic or Impossible difficulty.
Clear a UFO crash site with one soldier on Classic or Impossible difficulty.
In a single game, complete every Research Project.
Have a soldier survive every mission in a full game.
Shoot down 40 UFOs.
Cure poison on five soldiers in a single mission. Single player only.
In a single game, shoot down one of each alien craft.
Take your new ally into the final challenge.
Complete Gangplank.
Complete Confounding Light with more than 3 turns left on the timer.
Complete Confounding Light.
Complete Friends in Low Places.
Kill 500 aliens.
In a single game, complete every Foundry project.
Beat the game on any difficulty.
Make contact with the Ethereal hive mind.
Mind Control an Ethereal. Single player only.
Build the Gollop Chamber.
Staff the Research Labs with 80 scientists.
Staff the Engineering Department with 80 engineers
Build a S.H.I.V.
Kill an alien while flying. Single player only.
Earn the "Excellent" rating in every performance category on a terror mission.
Kill 50 aliens with explosive weapons.
Get satellite coverage over every country on one continent.
Find a soldier with the Gift.
Build a Laboratory.
In a single game, complete every Autopsy.
Successfully assault an Overseer UFO.
Build a Firestorm.
Acquire 1000 credits in one month.
Build the Hyperwave Relay.
Kill 150 aliens.
Build a suit of powered armor.
Advance one of your soldiers to Colonel rank.
Win a mission with an all-female squad. Single player only.
Recover the Hyperwave Beacon.
Uncover the alien base's location.
Build a Workshop.
Capture a live alien.
Stun an Outsider.
Fulfill a Council request.
Gain access to the lowest level in your base.
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.
