There are a lot of unlockable costumes in Injustice: Gods Among us on the PS3, WiiU, and Xbox 360.
Some of them require access to the Injustice: Gods Among Us game on an iOS device (iPhone, iPad, etc.) which I have listed separately.
I’ll be adding more to this list as I find them, so if I have missed any please leave me a comment so I can look into it.
Here are the alternate costumes you can unlock, and how to unlock them.
If you missed any of the exclusive costumes, check Ebay for the Injustice: Gods Among Us DLC codes you want.
Unlockable Costumes
Boss Grundy – Complete Classic Battle Mode with any character
Godfall Superman – Complete Story Mode with any character
Lex Luthor Alternate – Complete S.T.A.R. Labs with at least one star
New 52 Flash – Create a WB ID, or login to your WB account if you already have one
Yellow Lantern Alternate – Win a ranked online match
Unlockable Costumes From Archives
At the Main Menu, go to Bonus Features – Archives – Costumes and you’ll see a list of costumes that you can unlock with Armor Keys, which you get from simply playing the game in the various different modes, as well as from leveling up. Each costume costs an Armor Key, so you’ll need to play a little while to unlock all of them.
Aquaman Regime – Unlocked in the Archives for 1 Armor Key
Ares Regime – Unlocked in the Archives for 1 Armor Key
Bane Regime – Unlocked in the Archives for 1 Armor Key
Batman Insurgency – Unlocked in the Archives for 1 Armor Key
Black Adam Regime – Unlocked in the Archives for 1 Armor Key
Catwoman Regime – Unlocked in the Archives for 1 Armor Key
Cyborg Regime – Unlocked in the Archives for 1 Armor Key
Deathstroke Insurgency – Unlocked in the Archives for 1 Armor Key
Doomsday Regime – Unlocked in the Archives for 1 Armor Key
Flash Regime – Unlocked in the Archives for 1 Armor Key
Green Arrow Insurgency – Unlocked in the Archives for 1 Armor Key
Green Lantern Regime – Unlocked in the Archives for 1 Armor Key
Harley Quinn Insurgency – Unlocked in the Archives for 1 Armor Key
Hawkgirl Regime – Unlocked in the Archives for 1 Armor Key
Joker Insurgency – Unlocked in the Archives for 1 Armor Key
Killer Frost Regime – Unlocked in the Archives for 1 Armor Key
Lex Luthor Insurgency – Unlocked in the Archives for 1 Armor Key
Nightwing Regime – Unlocked in the Archives for 1 Armor Key
Raven Regime – Unlocked in the Archives for 1 Armor Key
Shazam Regime – Unlocked in the Archives for 1 Armor Key
Sinestro Regime – Unlocked in the Archives for 1 Armor Key
Solomon Grundy Regime – Unlocked in the Archives for 1 Armor Key
Superman Regime – Unlocked in the Archives for 1 Armor Key
Wonder Woman Regime – Unlocked in the Archives for 1 Armor Key
Unlockable Costumes From iOS Game
Arkham Harley – Obtain any Joker character card
Batman Beyond – Obtain any Batman character card
Knightfall Bane – Rate teh Injustice: Gods Among Us mobile game
New 52 Green Lantern – Successfully complete a Bonus Battle
Exclusive Costumes
If you missed your opportunity to pre-order the game to get some of these exclusive costumes, check out the Injustice: Gods Among Us DLC on Ebay.
Arkham City Batman – Exclusive pre-order bonus from Walmart
Arkham City Catwoman – Exclusive pre-order bonus from Walmart
Arkham City Joker – Exclusive pre-order bonus from Walmart
Flashpoint Aquaman – Unlocked by purchasing the Season Pass
Flashpoint Deathstroke – Unlocked by purchasing the Season Pass
Flashpoint Wonder Woman – Unlocked by purchasing the Season Pass
New 52 Batman – Exclusive bonus from the Collector’s Edition
New 52 Superman – Exclusive bonus from the Collector’s Edition
New 52 Wonder Woman – Exclusive bonus from the Collector’s Edition
Red Son Solomon Grundy – Exclusive pre-order bonus from Gamestop
Red Son Superman – Exclusive pre-order bonus from Gamestop
Red Son Wonder Woman – Exclusive pre-order bonus from Gamestop