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Honorary Mason

Finish waves 1 through 30 on any map in Infestation.

Honorary Mason0
3 guidesOnline/OfflineSingle PlayerCooperative
TheLastDonTheLastDon405,427
11 Jun 2011
10 0 0
This is simple. I have confirmed that you don't need to do it in one sitting. For example if you die on level 9 it's ok to restart level 9 and continue on. Also, if you're dead on level 10, 20, or 30 but your teammate finishes the level you will get the achievement.