Kill three enemies with one explosion five times

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

Kill 20 enemies melee-attacking from behind

Finish the game in Hard Mode

Finish the game in Easy Mode

Find 30 treasures

Kill 30 enemies with the MP40

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

Kill 20 enemies with the Desert - 5

Kill 20 enemies with a brutal combo

Find 15 treasures

Find 10 treasures

Kill 30 enemies with headshots