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