Botan Jungle, Temple of Argus and Tekunin Warship
Walk down the path in front of you when you begin the level Botan Jungle; the relic Kira's Knife is in the second tree. Look in the far right corner when you fight the red ninjas in the Temple of Argus. The relic called Moloch's Ball is hidden here. Search the second dead body you find in the Tekunin Warship to find the relic Kung Lao's Hat. For Jade's Bracelet, look on the right of the railings in the place where you fight Tekunin.
Arctika Relic, Lin Kuei Palace and Charred Mountain
Beat Tengu in Arctika and then smash the ice shelf outside for Jax's Beret. Look behind the altar where you saved Frost in Lin Kuei Palace; the relic Frost's Mask is hidden here. Still in Lin Kuei Palace, search the dead body in the left center of the hall, three times. Take a break from fighting the Red Dragon in the level Charred Mountain to pick up a relic. You can find Sindel's Brush straight ahead of you and to the left.
Red Dragon Caverns, Nether Realm Cliffs and Shinnok's Spire
Defeat Sareena in the Red Dragon Caverns and then smash the blue barrels to the left of the exit for the relic Sareena's Sash. Shinnok's Crown is located in Never Realm Cliffs, on the second level of the cliffs and behind the group of zombies. Ascend to the fifth level of the spire in the level Shinnok's Spire; the Nitara's Orb is on the opposite the KAK chest.
Shao Kahn's Fortress and Edenian Ruins
Don't leave after freeing Shujinko from his cell in Shao Kahn's Fortress; go into the apparently empty cell to find Shujinko's Medal. Turn right when you enter the stage for fighting the Kahn statue; enter the small room ahead of you. Pick up the relic Sheeva's Earing at the left of this room. Beat the skulls in Edenian Ruins and open each of the chests. Go over to the KAK chest to discover Motaro's Horn.