Perfect chapter 1 (Multiplayer)
|Complete all primary and secondary objectives in chapter 1|
I've heard that the single player cheats also work in Co-op campaign, and although I'm unsure I'd say either using cheats or getting a bunch of your good friends to play Co-op campaign are about the only ways you can achieve this. Anyway, to get this Achievement you'll have to complete all four missions of Chapter One. This includes the Side Objectives shown with a yellow dot on the MiniMap.
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