Finish the game in Hard Mode

Kill three enemies with one explosion five times

Kill 20 enemies melee-attacking from behind

Kill 50 enemies with the Moss - 12

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

Finish the game in Easy Mode

Kill 30 enemies with the MP40

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

Kill 50 enemies with the M4

Kill three enemies with one explosion

Find 50 treasures

Find 40 treasures

Kill 30 enemies with the M79