|Trial by, and on, Fire||20|
|Survive first 10 Horde waves on Combustible Map Pack maps as a team|
As described, you only need to complete the first ten waves of each CMP map in Horde mode, not the entire run. This can be done on Casual with any number of people (despite it saying "as a team" you can do this alone). The maps are:
The Combustible Map Pack can be pruchased through the marketplace for 800MSP.
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