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Complete 6 Secondary Objectives

Without Question0
2 guidesOffline Game ModeSingle Player
08 Oct 2011
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Secondary Objectives are the yellow targets on your map. They mostly consist of gathering Intel (pressing X near a Laptop-Box) or blowing up certain vehicles or turrets.

If you did every Secondary Objective from the beginning you will get this achievement on Onslaught for destroying all the Anti-Air-Guns, if not sooner.