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