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