| Achievement | How to unlock
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| - Get 100 Stars in S.T.A.R. Lab Mode.
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| - Complete 50% of Story Mode.
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| - Defeat every Villain With Batman.
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| - Perform every level interaction once.
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| - Knock opponent through all transitions across all levels.
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| - Win a single online match.
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| - Win 100 complete Online Matches.
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| - Enter Online Practice with someone on your friends list.
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| - Cause maximum damage in all Arenas (does not include Practice mode).
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| - Unlock a costume in the Archives.
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| - Perform every Meter Burn special move of every character.
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| - Win a match with the super move of any character.
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| - Win a multiplayer match with a timeout.
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- Gonna Need More Closet Space
| - Unlock All costumes in the Archives.
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| - Use every interactable and win in a multiplayer match.
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| - Perform a 10 hit combo with every character.
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| - Unlock everything in the Archives.
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| - Win 10 complete Ranked matches.
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| - Equip a new Background Image.
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| - Beat All S.T.A.R. Lab Missions (Excluding DLC).
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| - Vote Correctly in a KOTH match.
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| - Complete 1 S.T.A.R. Lab Mission.
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| - Complete 100% of Story Mode.
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| - Equip a new Character Portrait.
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| - Win 1 complete Ranked match.
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| - Perform every special move of every character.
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| - Win all story mode minigames.
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| - Make a comeback when at low health (10% or less).
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| - Play 200 complete Online Matches.
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| - Get 3 stars on 1 S.T.A.R. Lab Mission.
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| - Dethrone the King in an online match.
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| - Win a match as Deathstroke without missing a shot (minimum 12 shots).
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| - Complete Classic Battle with any character.
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| - Perform every character's supermove.
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| - Win with Batman using every special move and his Supermove.
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| - Perform 8 throws and win in a multiplayer match.
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| - Complete Classic Battle with all characters.
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| - Send an opponent through all three Metropolis transitions in one fight.
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| - Win a match with Green Arrow using only arrows.
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| - Win a Clash sequence with any character.
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| - Complete All S.T.A.R. Lab Missions with 3 Stars.
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| - Knock an opponent through a transition.
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