Simply keep playing the game until you reach the shooting gallery area where you draw your guns out, now when an enemy comes out, you will want to wait until he starts to lean back to throw an item, once he is about to throw a weapon at you, you want to start tapping just above him and you should be able to destroy the weapon he is throwing just as it leaves his hand. now as soon as you destroy it, you will want to tap on the enemy to kill him and you will unlock this achievement.