How To: Earn the 'Onyx Medal' achievement in Gears of War 3

Earn the 'Onyx Medal' achievement in Gears of War 3

Want to unlock a mutator and the 'Onyx Medal' achievement in Gears of War 3? This is the quickest way to unlock the Onyx Medal and requires you to enter the campaign in insane mode in arcade on Act 3 Chapter 1. You'll want to use the one-shot for this!

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