Beat the game in Ironman mode on Classic or Impossible Difficulty.
Mind Control an Ethereal. Single player only.
Win a multiplayer match.
Beat the game on any difficulty.
Beat the game on Classic difficulty.
Clear a UFO crash site with one soldier on Classic or Impossible.
Beat the game on Impossible difficulty.
Kill 50 aliens with explosive weapons.
Kill 150 aliens.
Shoot down 40 UFOs.
Kill 500 aliens.
Have a soldier survive every mission in a full game.
Earn "Excellent" rating in every category on a terror mission.
Kill an alien while flying. Single player only.
In a single game, complete every Research Project.
In a single game, complete every Autopsy.
Find a soldier with the Gift.
Stun an Outsider.
Capture a live alien.
Uncover the alien base's location.
Build the Hyperwave Relay.
Build a Firestorm.
Build the Gollop Chamber.
Launch a Satellite.
Get satellite coverage over every country on one continent.
Build a suit of powered armor.
In a single game, shoot down one of each alien craft.
Complete a mission without losing a soldier.
Advance one of your soldiers to Colonel rank.
Staff the Research Labs with 80 scientists.
Acquire 1000 credits in one month.
Staff the Engineering Department with 80 engineers.
In a single game, complete every Foundry project.
Build a Laboratory.
Build a S.H.I.V.
Build a Workshop.
Win a v. Hard abduction within 5 turns on Classic or Impossible.
Complete a Research Project.
Win the game from each of the 5 starting locations.
Build a base facility.
Build an item.
Fulfill a Council request.
Gain access to the lowest level in your base.
Successfully assault an Overseer UFO.
Recover the Hyperwave Beacon.
Complete the tutorial mission.
Shoot down a UFO.
Make contact with the Ethereal hive mind.
Win a mission with an all-female squad. Single player only.
Modify a soldier in single player.
Augment a soldier in single player.
Get a Soldier to have 5 modifications in single player.
Deploy three tactical subsystems on a single soldier in single player.
Eliminate all alien waves.
Deal with the newest global threat.
Eradicate the infestation.
Beat the game without buying a Squad Size upgrade (Classic+ difficulty).
Eliminate an enemy's shield and kill it on the same turn in single player.
Field a fully enhanced squad and win the mission.
Kill a Muton Berserker in melee combat in single player.
Stop a squad member from suffocating in single player.
Jump two stories in one move in single player.
Make certain of the new threat's location.
Use Collateral Damage to blow up a car in single player.
Field a squad with 4 augmented soldiers, each with a different base ability and win the mission.
Field a squad where all members have at least two modifications (min. 4) and win the mission.
Field a squad consisting entirely of augmented soldiers and SHIVs (min. 4) and win the mission.
Kill an enemy as it is psionically attacking you in single player.
Proc Combat Rush on the entire squad (min. 4).
Kill an elite enemy Sniper with one of your own snipers in single player.
Have your special-duty soldier kill three enemies in the same mission.
Kill an elite enemy Medic with explosive damage in single player.
Kill an unseen enemy detected by a specially modified soldier in single player.
Beat a new special mission without losing any assets.
Cause an enemy to suicide.
Designate a highly decorated soldier as the Volunteer.
Get at least 4 kills with XCOM Base Security personnel.