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