Harry Potter and the Deathly Hallows - Part 1

This trophy really doesn't explain what a quick stun is, but the concept is very easy. To get this trophy, all you have to do is defeat fifty enemies with headshots. The aiming in this game is a bit of a pain, but keep pressing to aim until the aiming reticule snaps to the head. Then, fire away with ! Note that the enemy DOES have to be defeated for the stun to count.