Certain Costumes can be unlocked by meeting certain requirements
Unlockable How to Unlock Arkham City Harley Quinn Collect any Joker character in the iOS version of Injustice Batman Beyond Collect any Batman character in the iOS version of Injustice Boss Grundy Complete Classic Battle Elseworld Flash Complete All S.T.A.R. Labs Missions with Three Stars Godfall Superman Beat Story Mode Knightfall Bane Rate the iOS version of Injustice Lex Luthor's Kryptonite Suit Achieve at least one star in all S.T.A.R. Lab missions New 52 Flash Create or link a WBID to your gamertag New 52 Green Lantern Complete a bonus battle in the iOS version of Injustice New 52 Nightwing Reach Level 30 New 52 Shazam Beat All Shazam S.T.A.R. Labs Missions Prison Superman Beat all Battles in the iOS version of Injustice Yellow Lantern Win An Online Ranked Match
Doomsday Original Costume (Non-Playable)
If you go to the Fortress of Solitude Arena with two characters playing Doomsday, and they both have different costumes on including the Insurgency costume and the regular costume, then the Doomsday in the back of the level will be wearing the outfit from Death of Superman.
Contributed By: WWE_IS_REAL.
Achievement Description Value All Star Get 100 Stars in S.T.A.R. Lab Mode 10 Almost There Complete 50% of Story Mode 20 Arkham City Lockdown Defeat every Villain With Batman 10 Around and Around We Go Perform every level interaction once 20 Around The World Knock opponent through all transitions across all levels 15 Beginner's Luck! Win a single online match 10 Breaking Records Win 100 complete Online Matches 10 Buddy System Enter Online Practice with someone on your friends list 10 Bull in a China Shop Cause maximum damage in all Arenas (does not include Practice mode) 100 Cosplay Unlock a costume in the Archives 5 Feel the Burn! Perform every Meter Burn special move of every character 10 FINISHED Win a match with the super move of any character 10 Go Sit in the Corner Win a multiplayer match with a timeout 10 Gonna Need More Closet Space Unlock all costumes in the Archives 20 Groundbreaking Use every interactable and win in a multiplayer match 10 Heavy Hitter Perform a 10 hit combo with every character 10 Hoarder Unlock everything in Archives 50 Holy Knockout Batman! Win 10 complete Ranked matches 10 I Can Back it Up Equip a new Background Image 5 I Conquered All Beat All S.T.A.R. Lab Missions (Excluding DLC) 20 I Voted! Vote Correctly in a KOTH match 10 Iconic Representation Equip a new Icon 5 It Has Begun Complete 1 S.T.A.R. Lab Mission 10 Justice for All Complete 100% of Story Mode 80 Learning is Fun Complete Tutorial 10 Looking Good! Equip a new Character Portrait 5 Lucky Break Win 1 complete Ranked match 10 Metahuman Perform every special move of every character 10 Mini-Master Win all story mode minigames 25 Only a Real Master Make a comeback when at low health (10% or less) 10 Over The Top! Play 200 complete Online Matches 10 Overachiever Get 3 stars on 1 S.T.A.R. Lab Mission 15 Overthrown Dethrone the King in an online match 10 Perfect Aim Win a match as Deathstroke without missing a shot (minimum 12 shots) 10 Practice Makes Perfect Enter Practice Mode 10 Rise to the Top Complete Classic Battle with any character 10 Sidekick Reach Level 10 10 Statistical Advantage View Your Hero Card 10 Streak Ender Defeat a Survivor 10 Superhuman! Perform every character's supermove 10 The Caped Crusader Win with Batman using every special move and his Supermove 10 The Hero We Deserve Reach Level 100 100 Throwdown! Perform 8 throws and win in a multiplayer match 10 Top Rung Complete Classic Battle with all characters 25 Tourist Send an opponent through all three Metropolis transitions in one fight 30 True Marksman Win a match with Green Arrow using only arrows 10 Ultimate Battler Complete Battle Mode 50 Unstoppable Force Win a Clash sequence with any character 10 World's Finest Complete All S.T.A.R. Lab Missions with 3 Stars 100 Wrecking Ball Knock an opponent through a transition 10
Contributed By: Guard Master.
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