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