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