MORTAL KOMBAT: ARMAGEDDON UNLOCKABLES
Noob Saibot alternate costumes
Defeat all of the Shadow Ninjas the first time encountered then open the chest in the Lin Kuei Palace.
Quan Chi alternate costumes
Step on the rat in the tunnel after you travel through Door A1 in the Red Dragon Caverns.
Raiden alternate costumes
Defeat the Shao Khan Colossus, then enter the first room on the left.
Rain alternate costumes
Open the chest at the end of the area in Arctika where you are attacked by Red Dragon Spies before you meet Rain.
Reiko alternate costumes
As you enter the first area with blades in Shao Khan's Fortress, move down one of the halls to the left.
Reptile alternate costumes
Defeat the Hybrid Dragons in the Red Dragon Caverns.
Sareena alternate costumes
Defeat Kai, Serenna, and Jatakka.
Shang Tsung alternate costumes
At the beginning of Shao Khan's Fortress, hit the ground pound icon which is located to the right and up the ramp.
Shao Kahn alternate costumes
Defeat Shao Khan's Statue.
Shinnok alternate costumes
Go to the left-most side of the area in the Netherrealm with the falling rocks.