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