there is a mod someone made where you can replace a file in the bunch of heroes folder which turns every wave into 1 mob per wave and you can get the achievement very easy that way. im not sure if this file is legit although people have reported success but its in a thread under the game on spuf.
i apologize if this post gets deleted if somehow this is advertising but i know how annoying it gets during the steam promotions when they do little 1mb patches everyday that break the trainer so that is a really good work around for this game since there are many games that might not have work arounds and be fully trainer dependent.
although i appreciate the hard work CH puts in especially during the steam promotions where it tends to as i said get chaotic. the lifetime sub has already paid for itself many times over in avoided stress/grief
[Edited by yobo, 12/21/2011 4:05:10 PM]
So please, can we have this cheat updated? Please.. please.. please..
[Edited by xenoGears, 1/4/2012 5:59:41 AM]
Just test it and already OK after been update...