|Skeletons in your Closet||20|
|Complete waves 1 through 10 on all Flashback Map Pack maps in Horde (any difficulty)|
As described, you only need to complete the first ten waves of each FMP map in Horde mode, not the entire run. This can be done on Casual with any number of people. The maps are:
These maps can be obtained for free if you purchase a NEW copy of GOW2, or purchased for 400MSP through the Marketplace.
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