Kill five enemies in a row with a single punch, after softening them up with gunfire

Clear the specified stage with 25 or more gems

Finish the game in Easy Mode

Kill 30 enemies with the Dragon Sniper

Kill 30 enemies with the MP40

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

Kill 10 enemies by aiming while hanging from a ledge

Kill 20 enemies with the Desert - 5

Find 30 treasures

Kill five enemies in a row with headshots

Kill 20 enemies with the Wes - 44

Kill 20 enemies with a brutal combo

Find the Strange Relic