Here is the full list of all 51 Injustice: Gods Among Us Ultimate Edition trophies - there are 38 bronze, 10 silver, 2 gold and 1 platinum.
Perform every character's supermove
Enter Online Practice with someone on your friends list
Knock opponent through all transitions across all levels
Defeat every Villain With Batman
Play 200 complete Online Matches
Win 100 complete Online Matches
Complete 100% of Story Mode
Win all story mode minigames
Complete 50% of Story Mode
Cause maximum damage in all Arenas (does not include Practice mode)
Complete Classic Battle with any character
Get 100 Stars in S.T.A.R. Lab Mode
Win a Clash sequence with any character
Enter Practice Mode
Defeat a Survivor
Win 10 complete Ranked matches
Vote Correctly in a KOTH match
Reach Level 10
Dethrone the King in an online match
Unlock All costumes in the Archives
Unlock a costume in the Archives
Win a match as Deathstroke without missing a shot (minimum 12 shots)
Win with Batman using every special move and his Supermove
Make a comeback when at low health (10% or less)
Send an opponent through all three Metropolis transitions in one fight
Win a match with Green Arrow using only arrows
Perform 8 throws and win in a multiplayer match
Use every interactable and win in a multiplayer match
Win a multiplayer match with a timeout
Equip a new Icon
Knock an opponent through a transition
Get 3 stars on 1 S.T.A.R. Lab Mission
Complete 1 S.T.A.R. Lab Mission
Win a match with the super move of any character
Equip a new Character Portrait
Equip a new Background Image
View Your Hero Card
Win 1 complete Ranked match
Win a single online match
You've unlocked all Trophies!
Complete Classic Battle with all characters
Complete Battle Mode
Beat All S.T.A.R. Lab Missions (Excluding DLC)
Reach Level 100
Complete Tutorial
Complete All S.T.A.R. Lab Missions with 3 Stars
Perform a 10 hit combo with every character
Perform every special move of every character
Perform every Meter Burn special move of every character
Perform every level interaction once
Unlock everything in the Archives