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