Here is the full list of all 12 Mortal Kombat Arcade Kollection trophies - there are 7 bronze, 4 silver and 1 gold.
Win 200 matches
Finish all three games
Finish Ultimate Mortal Kombat 3 on any difficulty
Perform your first Animality
Win a flawless victory in a ranked kombat
Win your 1st online 1v1
Finish Mortal Kombat II
Perform your first Friendship
Win your first double flawless victory against CPU
Perform your first Babality
Finish Mortal Kombat
Perform your first Fatality