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XCOM: Enemy Unknown

Codes

Hidden Heroes

Change the Name of a Hero to one of the following. This can be done from Barrack under View Soldiers, clicking a Soldier, then going to customize. It can also be done from the customize menu on the deploy screen. Note, using one of these heroes will disable achievements.

EffectCode
Joe KellyUnlock Joe Kelly - Heavy
Ken LevineUnlock Ken Levine - Sniper
Otto ZanderUnlock Otto Zander - Assault
Sid MeierUnlock Sid Meier- Support

Contributed By: SevenTenths.

Achievements

Steam Achievements

AchievementDescription
Build a Workshop....and Practice.
Win the game from each of the 5 starting locations.A Continental Fellow
Have a soldier survive every mission in a full game.Ain't No Cavalry Comin'
Complete Confounding Light with more than 3 turns left on the timer.All Aboard
In a single game, complete every Autopsy.All Employees Must Wash Hands…
Get satellite coverage over every country on one continent.All Together Now
Successfully assault an Overseer UFO.And Hell's Coming With Me
Complete the tutorial mission.And So It Begins…
Kill an alien while flying. Single player only.Angel of Death
Earn the "Excellent" rating in every performance category on a terror mission.As A Scalpel
Kill 50 aliens with explosive weapons.Bada Boom
Complete Confounding Light.Bait the Hook
Find a soldier with the Gift.Beyond the Veil
Play a multiplayer match against someone with this achievement.Bubonic
Build an item.Combat Ready
Complete Deluge.Disaster Averted
Gain access to the lowest level in your base.Drums in the Deep
Beat the game on Classic difficulty.Earth First
In a single game, complete every Research Project.Edison
Launch a Satellite.Eye in the Sky
Win a mission with an all-female squad. Single player only.Flight of the Valkyries
Complete Furies.Great Minds Think Alike
Fulfill a Council request.Happy to Oblige
Beat the game on any difficulty.Humanity's Savior
In a single game, shoot down one of each alien craft.Hunter/Killer
Clear a UFO crash site with one soldier on Classic or Impossible difficulty.Lone Wolf
Build a suit of powered armor.Man No More
Win a multiplayer match.Meet New People. Then Kill Them.
Complete Friends in Low Places.New Friend
Beat the game in Ironman mode on Classic or Impossible Difficulty.No Looking Back
Complete Deluge without activating more than 2 valves.No Sweat
Recover the Hyperwave Beacon.Off My Planet
Build the Gollop Chamber.On the Shoulders of Giants
Staff the Engineering Department with 80 engineers.One Gun at a Time
Staff the Research Labs with 80 scientists.Oppenheimer
Beat the game on Impossible difficulty.Our Finest Hour
Kill 500 aliens.Pale Horse
Capture a live alien.Prisoner of War
Build a Firestorm.Ride the Lightning
Take your new ally into the final challenge.Rising Dragon
Have your newest ally volunteer for the most difficult duty.Saved to Savior
Build the Hyperwave Relay.See All, Know All
Shoot down 40 UFOs.Shooting Stars
In a single game, complete every Foundry project.Skunkworks
Shoot down a UFO.Tables Turned
Complete Gangplank.The Bigger They Are
Complete Portent.The Chase Is On
Stun an Outsider.The Gatekeeper
Advance one of your soldiers to Colonel rank.The Hardest Road
Make contact with the Ethereal hive mind.The Volunteer
Build a Laboratory.Theory...
Build a base facility.Up and Running
Complete a mission without losing a soldier.We Happy Few
Kill 150 aliens.Welcoming Committee
Complete a Very Hard abduction mission in five turns or less on Classic or Impossible difficulty.Wet Work
Complete a Research Project.What Wonders Await
Acquire 1000 credits in one month.Worth Every Penny
Uncover the alien base's location.X Marks the Spot
Mind Control an Ethereal. Single player only.Xavier
Build a S.H.I.V.You Have 5 Seconds to Comply

Contributed By: Guard Master.