Beat the game on any difficulty.
Make contact with the Ethereal hive mind.
Build the Gollop Chamber.
Acquire 1000 credits in one month.
In a single game, complete every Autopsy.
Successfully assault an Overseer UFO.
Kill 50 aliens with explosive weapons.
Build the Hyperwave Relay.
Kill an alien while flying. Single player only.
Build a Firestorm.
Build a suit of powered armor.
Find a soldier with the Gift.
Advance one of your soldiers to Colonel rank.
Kill 150 aliens.
Build a S.H.I.V.
Win a mission with an all-female squad. Single player only.
Get satellite coverage over every country on one continent.
Gain access to the lowest level in your base.
Recover the Hyperwave Beacon.
Uncover the alien base's location.
Build a Workshop.
Build a Laboratory.
Stun an Outsider.
Fulfill a Council request.
Capture a live alien.
Build a base facility.
Shoot down a UFO.
Launch a Satellite.
Complete a mission without losing a soldier.
Build an item.
Complete a Research Project.
Complete the tutorial mission.
Beat the game in Ironman mode on Classic or Impossible difficulty.
Win a multiplayer match.
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.
Kill 500 aliens.
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.
In a single game, shoot down one of each alien craft.
Cure poison on five soldiers in a single mission. Single player only.
Staff the Research Labs with 80 scientists.
Staff the Engineering Department with 80 engineers
In a single game, complete every Foundry project.
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.
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.
