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