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