How To: Earn the "Barrel Roll" achievement in Left 4 Dead 2 on the Xbox 360

There's a massive achievement that you can get called "Barrel Rolled" in Left 4 Dead 1 & 2's new DLC "The Sacrifice" and you can get this achievement right at the beginning of the game! In this video you will learn how to earn the achievement quickly with AI bots as your team on the Xbox 360.