Here is the full list of all 51 Mortal Kombat trophies - there are 34 bronze, 15 silver, 1 gold and 1 platinum.
You've unlocked all Trophies!
Gain Mastery of All Fighters
Discover and fight Hidden Kombatant 1 in Arcade Ladder
Gain Mastery of 1 Fighter
Win 10 Ranked Online Matches in a row
Earn 2500 Respect Points via king of the hill Matches
Unlock Mileena's 3rd Alternate Costume
Complete all Tower missions
Complete all Test Your Might mini-game challenges
Complete all Test Your Sight mini-game challenges
Complete Arcade Ladder on max difficulty without using a continue
Complete all Test Your Strike mini-game challenges
Win 100 total Online Matches
Complete 200 Versus matches (online OR offline)
Earn 1000 Respect Points via king of the hill Matches
Complete 100 Online Matches
Win Arcade Tag Ladder with robot Sektor and Cyrax
Complete Arcade Ladder with All Fighters
Unlock all Alternate Costumes
Win 10 king of the hill Matches in a row
Comeback with under 10% health in an Online Ranked Match
Win both rounds with timer running out in an Online Ranked Match
Win A Ranked Online Match without jumping
Perform 8 throws in an Online Ranked Match
Win an Online Match
Get a Flawless Victory in an Online Match
Unlock 100% of the Krypt
Complete Arcade Ladder without blocking (allowed to continue)
Get all MK Dragons in Test Your Luck
Perform a Fatality with all playable fighters
Perform every fighter's hidden finishing move
Successfully land every playable fighter's X-Ray
Perform every fighter's forward and backwards throws
Discover and fight Hidden Kombatant 3 in Arcade Ladder
Discover and fight Hidden Kombatant 2 in Arcade Ladder
Discover and fight Hidden Kombatant 4 in Arcade Ladder
Perform 1 of each type of "-ality"
Perform any fighter's hidden finishing move
Complete 25 Tower missions
Unlock 50% of the Krypt
Unlock Hidden Fighter "Quan Chi"
Complete Story Mode 100%
Unlock Hidden Fighter "Cyber Sub-Zero"
Complete Story Mode 50%
Complete Arcade Ladder with Any Fighter
Complete Fatality Trainer
Complete Tutorial Mode
Perform a Fatality!
Perform and land a Tag Combo
Spill 10000 pints of blood
Perform a 10-hit combo with any fighter