Full list of all 50 Mortal Kombat achievements worth 1,000 gamerscore. It takes around 300-500 hours to unlock all of the achievements on Xbox 360.
Earn 2500 Respect Points via king of the hill matches
Win 10 Ranked Online Matches in a row
Gain Mastery of 1 Fighter
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
Complete 200 Versus matches (online OR offline)
Perform every fighter's hidden finishing move
Earn 1000 Respect Points via king of the hill matches
Discover and fight Hidden Kombatant 2 in Arcade Ladder
Win 100 total Online Matches
Win 10 king of the hill matches in a row
Get all MK Dragons in Test Your Luck
Complete 100 Online Matches
Get a Flawless Victory in an Online Match
Perform 8 throws in an Online Ranked Match
Discover and fight Hidden Kombatant 1 in Arcade Ladder
Discover and fight Hidden Kombatant 3 in Arcade Ladder
Complete Arcade Ladder on max difficulty without using a continue
Complete Arcade Ladder with All Fighters
Perform a Fatality with all playable fighters
Complete Arcade Ladder without blocking (allowed to continue)
Unlock Mileena's 3rd Alternate Costume
Complete all Tower missions
Discover and fight Hidden Kombatant 4 in Arcade Ladder
Win Arcade Tag Ladder with robot Sektor and Cyrax
Perform every fighter's forward and backwards throws
Successfully land every playable fighter's X-Ray attack
Unlock all Alternate Costumes
Unlock 100% of the Krypt
Complete all Test Your Might mini-game challenges
Complete all Test Your Sight mini-game challenges
Perform 1 of each type of "-ality"
Perform any fighter's hidden finishing move
Complete all Test Your Strike mini-game challenges
Win an Online Match
Unlock 50% of the Krypt
Complete Arcade Ladder with Any Fighter
Complete 25 Tower missions
Perform and land a Tag Combo
Perform a Fatality!
Complete Tutorial Mode
Complete Fatality Trainer
Complete Story Mode 100%
Unlock Hidden Fighter "Quan Chi"
Unlock Hidden Fighter "Cyber Sub-Zero"
Complete Story Mode 50%
Spill 10000 pints of blood
Perform a 10-hit combo with any fighter
Gain Mastery of All Fighters