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 any difficulty.

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 50 aliens with explosive weapons.

Kill 150 aliens.

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.

Kill an alien while flying. Single player only.

In a single game, complete every Autopsy.

Find a soldier with the Gift.

Capture a live alien.

Stun an Outsider.

Uncover the alien base's location.

Build the Hyperwave Relay.

Build the Gollop Chamber.

Build a Firestorm.

Launch a Satellite.

Get satellite coverage over every country on one continent.

In a single game, shoot down one of each alien craft.

Build a suit of powered armor.

Cure poison on five soldiers in a single mission. Single player only.

Complete a mission without losing a soldier.

Advance one of your soldiers to Colonel rank.

Acquire 1000 credits in one month.

Staff the Research Labs with 80 scientists.

Staff the Engineering Department with 80 engineers

In a single game, complete every Foundry project.

Build a S.H.I.V.

Build a Laboratory.

Build a Workshop.

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 a Research Project.

Build a base facility.

Build an item.

Gain access to the lowest level in your base.

Fulfill a Council request.

Successfully assault an Overseer UFO.

Recover the Hyperwave Beacon.

Shoot down a UFO.

Complete the tutorial mission.

Make contact with the Ethereal hive mind.

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.