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

Find 45 treasures

Finish the game in Easy Mode

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

Kill 50 enemies in a row without dying

Find 40 treasures

Kill 100 enemies with headshots

Kill 30 enemies with the Dragon Sniper

Kill 50 enemies with the M4

Find 25 treasures

Kill 20 enemies with the Wes - 44

Kill 10 enemies by aiming while hanging from a ledge