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