| Achievement | How to unlock
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| ...as a scalpel | Complete a perfect terror mission.
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| ...and Practice | Build a Workshop.
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| A Continental Fellow | Win the game from every possible HQ starting location.
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| Ain't no cavalry comin' | Bring the same soldier on every single mission.
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| All Employees Must Wash Hands Before Returning to Work | Perform an autopsy on every alien type in one game.
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| All together now | Add satellite coverage over every country in one continent.
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| And he rode upon a pale horse, and his name was death. | Kill 250 aliens.
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| Bada Boom | Kill 50 aliens with explosive devices.
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| Beyond the Veil | Find a soldier with the Gift.
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| Bubonic | A viral MP achievement received by playing against someone who has earned it.
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| Combat Ready | Build your first item.
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| Drums in the Deep | Excavate to the lowest level in your base.
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| Earth First | Win on hard difficulty.
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| Edison | Research everything in the tech tree in one game.
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| Eye in the Sky | Launch your first Satellite.
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| Humanity's Savior | Win on any difficulty.
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| Hunter/Killer | Intercept and shoot down one of every alien vessel in one game.
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| I am Iron Man! | Beat the game in "Ironman" mode. No reloads.
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| Is Everyone OK? | Survive a Base Assault.
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| Man No More | Build your first Level 3 suit of armor.
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| Meet New People and Then Kill Them | Win your first online tactical battle.
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| Neo | Beat the Temple Ship mission with only one soldier.
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| On the Shoulders of Giants | Build the Gollop Chamber.
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| One gun at a time | Earn 50 Engineers in one game.
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| Oppenheimer | Earn 50 scientists in one game.
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| Our Finest Hour | Win on Hopeless difficulty.
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| Prisoner of War | Capture your first alien.
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| Ride the Lightning | Build your first Firestorm.
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| See All, Know All | Build the Hyperwave Uplink.
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| Shooting Stars | Shoot down 30 UFOs.
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| Skunkworks | Complete every foundry project in one game.
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| The Hardest Road | Have a soldier earn the rank of colonel.
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| The Persuader | Interrogate Every Alien Type in one game.
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| The Watchers | Interrogate Your First Alien Captive.
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| Theory... | Build a Laboratory.
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| Up and Running | Build your first facility.
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| We Happy Few | Complete a mission with no soldier deaths.
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| Welcome to Earth, Motherfucker. | Kill 200 aliens.
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| Wet work | Complete a very hard abduction mission in 5 turns.
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| What Wonders Await | Research your first Tech.
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| Worth Every Penny | Earn 200 credits in funding in one month.
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| X Marks the Spot | Crack the alien code.
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| Xavier | Mind control an Ethereal.
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