Defeat three enemies with one explosion

Complete one Cooperative Multiplayer game

Find the Strange Relic

Defeat 20 enemies with hand-to-hand combat

Find one treasure

Finish the game in Normal Mode

Kill 50 enemies with the SAS - 12

Kill 50 enemies with the M4

Kill 20 enemies by shooting from the hip (without aiming with the L1 button)

Find 35 treasures

Find 30 treasures

Kill 20 enemies with a brutal combo

Find 15 treasures