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