http://www.introversion.co.uk/multiwinia/sharedresources/gfx/multiwinia-splash.jpg I'm aware that this is approximately 7 years late, but I felt that Mutiwinia deserved a decent steam achievement guide never-the-less: http://steamcommunity.com/sharedfiles/filedetails/?id=410313149

simply a resource for those looking.
Someone lurks these forums. I mean we are both here in a metaphorical sense.

Aggravated Assualt After testing various win conditions E.g... ⋅ all human teams ⋅ one ai either on a team or unallied with human player ⋅ two human vs two ai teams ⋅ ai/human vs ai/human teams ⋅ a series of games only using steam versions ⋅&nb...

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http://astats.astats.nl/astats/Steam_Ac ... 7995281961

Here is a list of non-cheaters who have earned the master player achievement. I bet you could reach to one of them and they may be able to help you.