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