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I'll try again after the update with hints comes out though :-)
It's odd. I increased infection rates of trasmissions. That said, there seems to be a 'switch' built in the necroa virus that automatically...
Well technically I got the NAZG achievement last night, but technically I also cheated. Sorry guys, just wanted to do the darn thing:D
Been there, buddy.
Hate to burst anyone's genetic bubble ;) but I really don't think the NAZG achievement is possible. Perhaps in a future update, but as it stands...