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