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