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