At the Barracks, select "View Soldiers". Select a soldier, then select "Customize". Note: This can also be done from the "Customize" menu at the "Deploy" screen. Unlock the following characters by changing the name of the soldier to the corresponding names. Note: This will prevent achievements or trophies from being earned:
CHARACTER - NAME
Joe Kelly (Heavy) - Joe Kelly
Ken Levine (Sniper) - Ken Levine
Otto Zander (Assault) - Otto Zander
Sid Meier (Support) - Sid Meier
Humanity's Savior - Beat the game on any difficulty.
Bada Boom - Kill 50 aliens with explosive weapons.
Welcoming Committee - Kill 150 aliens.
As A Scalpel - Earn the "Excellent" rating in every performance category on a terror mission.
Edison - In a single game, complete every Research Project.
All Employees Must Wash Hands... - In a single game, complete every Autopsy.
Eye in the Sky - Launch a Satellite.
All Together Now - Get satellite coverage over every country on one continent.
Hunter/Killer - Build a suit of powered armor.
We Happy Few - In a single game, shoot down one of each alien craft.
Man No More - Complete a mission without losing a soldier.
Worth Every Penny - Acquire 1000 credits in one month.
Oppenheimer - Staff the Research Labs with 80 scientists.
One Gun at a Time - Staff the Engineering Department with 80 engineers.
Skunkworks - In a single game, complete every Foundry project.
You Have 5 Seconds to Comply - Build a S.H.I.V
Theory... - Build a Laboratory.
...and Practice - Build a Workshop.
What Wonders Await - Complete a Research Project.
Up and Running - Build a base facility.
Combat Ready - Build an item.
Drums in the Deep - Gain access to the lowest level in your base.
Happy to Oblige - Fulfill a Council request.
Tables Turned - Shoot down a UFO.
And So It Begins... - Complete the tutorial mission.
Meet New People. Then Kill Them. - Win a multiplayer match.
Angel of Death - Kill an alien while flying. Single player only.
Beyond the Veil - Find a soldier with the Gift.
Prisoner of War - Capture a live alien.
The Gatekeeper - Stun an Outsider.
X Marks the Spot - Uncover the alien base's location.
See All, Know All - Build the Hyperwave Relay.
On the Shoulders of Giants - Build the Gollop Chamber.
Ride the Lightning - Build a Firestorm.
Poison Control - Cure poison on five soldiers in a single mission. Single player only.
And Hell's Coming With Me - Successfully assault an Overseer UFO.
The Volunteer - Make contact with the Ethereal hive mind.
Flight of the Valkyries - Win a mission with an all-female squad. Single player only.
Earth First - Beat the game on Classic difficulty.
Lone Wolf - Clear a UFO crash site with one soldier on Classic or Impossible difficulty.
Pale Horse - Kill 500 aliens.
Shooting Stars - Shoot down 40 UFOs.
Ain't No Cavalry Comin' - Have a soldier survive every mission in a full game.
The Hardest Road - Advance one of your soldiers to Colonel rank.
Wet Work - Complete a Very Difficult abduction mission in five turns or less on Classic or Impossible difficulty.
A Continental Fellow - Win the game from each of the 5 starting locations.
Xavier - Mind Control an Ethereal. Single player only.
Off My Planet - Recover the Hyperwave Beacon.
No Looking Back - Beat the game in Ironman mode on Classic or Impossible difficulty.
Our Finest Hour - Beat the game on Impossible difficulty.
You Win - Earn all Bronze, Silver, and Gold trophies.
Bait the Hook - Complete Confounding Light.
New Friend - Complete Friends in Low Places.
All Aboard - Complete Confounding Light with more than 3 turns left on the timer.
The Bigger They Are - Complete Gangplank.
Rising Dragon - Take your new ally into the final challenge.