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Uploaded on Oct 7, 2010
There are a few of these enemies in the game, but I waited until Chapter 10 since I had more ammo at this point (upgrades, etc). You can't actually kill him this way, which makes this achievement an odd one. All kinds of blasts will count as a head shot. Don't reload checkpoint if grinding this out, die (reloading checkpoints erases your data and puts you back further).