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