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