Kill 30 enemies with the Dragon Sniper

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

Kill 30 enemies with the MP40

Find 20 treasures

Kill five enemies in a row with headshots

Find 15 treasures

Kill 50 enemies in a row without dying

Find 10 treasures

Kill 30 enemies with headshots

Kill 10 enemies with headshots

Find one treasure

Kill Zeus