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