Take your new ally into the final challenge.
Kill a Muton Berserker in melee combat in single player
Build a S.H.I.V.
Kill an enemy as it is psionically attacking you in single player
Build an item.
Stop a squad member from suffocating in single player
Field a squad where all members have at least two modifications (min. 4) and win the mission
Build a Workshop.
Recover the Hyperwave Beacon.
Successfully assault an Overseer UFO.
Make contact with the Ethereal hive mind.
Staff the Research Labs with 80 scientists.
Stun an Outsider.
Kill an unseen enemy detected by a specially modified soldier in single player
Modify a soldier in single player
In a single game, shoot down one of each alien craft.
Complete Furies
Beat the game on any difficulty.
Deploy three tactical subsystems on a single soldier in single player
Advance one of your soldiers to Colonel rank.
Find a soldier with the Gift.
Get satellite coverage over every country on one continent.
Eradicate the infestation
In a single game, complete every Research Project.
Clear a UFO crash site with one soldier on Classic or Impossible difficulty.
Build a Firestorm.
Win the game from each of the 5 starting locations.
Cause an enemy to suicide
Fulfill a Council request.
Deal with the newest global threat
Beat the game on Impossible difficulty.
Beat the game on Classic difficulty.
Build the Gollop Chamber.
Eliminate an enemy's shield and kill it on the same turn in single player
Build the Hyperwave Relay.
In a single game, complete every Foundry project.
Gain access to the lowest level in your base.
Get at least 4 kills with XCOM Base Security personnel
Augment a soldier in single player
Designate a highly decorated soldier as the Volunteer
Have a soldier survive every mission in a full game.
Capture a live alien.
Complete Friends In Low Places.
Make certain of the new threat's location
Complete Deluge
Shoot down a UFO.
Win a mission with an all-female squad. Single player only.
Build a Laboratory.
Kill an elite enemy Sniper with one of your own snipers in single player
Earn the "Excellent" rating in every performance category on a terror mission.
Proc Combat Rush on the entire squad (min. 4)
Kill 500 aliens.
Kill an alien while flying. Single player only.
Eliminate all alien waves
Uncover the alien base's location.
Staff the Engineering Department with 80 engineers.
Shoot down 40 UFOs.
Complete the tutorial mission.
Field a fully enhanced squad and win the mission
Acquire 1000 credits in one month.
In a single game, complete every Autopsy.
Mind Control an Ethereal. Single player only.
Beat the game without buying a Squad Size upgrade (Classic+ difficulty)
Complete Confounding Light.
Launch a Satellite.
Beat a new special mission without losing any assets
Beat the game in Ironman mode on Classic or Impossible Difficulty.
Build a base facility.
Field a squad consisting entirely of augmented soldiers and SHIVs (min. 4) and win the mission
Complete a mission without losing a soldier.
Complete a Research Project.
Build a suit of powered armor.
Get a Soldier to have 5 modifications in single player
Kill 150 aliens.
Complete a Very Hard abduction mission in five turns or less on Classic or Impossible difficulty.
Jump two stories in one move in single player
Complete Gangplank.
Have your special-duty soldier kill three enemies in the same mission
Use Collateral Damage to blow up a car in single player
Kill an elite enemy Medic with explosive damage in single player
Field a squad with 4 augmented soldiers, each with a different base ability and win the mission
Complete Confounding Light with more than 3 turns left on the timer.
Kill 50 aliens with explosive weapons.