How to Earn the "Mutant Overlord" achievement and gnome avatar award in Left 4 Dead 2

This one's a good one. Besides learning about the "Mutant Overlord" achievement in Left 4 Dead 2 on the Xbox 360, you'll also be learning how to get that cute little gnome avatar award. If the gnome avatar is new information to you, then you can't pass this gaming tutorial up!

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