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