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