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