It's time to lock and load, achievement hunters! This tutorial is on the popular zombie shooter, Left 4 Dead 2. This takes place in their DLC, The Passing. The achievement is called Killing 'Em Swiftly and it requires you to find a jukebox and find a new song to play. It's an easy 20 gamer points to add to your gamerscore. So check it out and good luck!
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