Maybe we can get our money back... The game is BROKEN (as achievements are part of the game, part of the code) and devs here confirm it, as well as that they WILL not do anything about it. In this case for those who have payed for this game with credit cards- there is something like chargeback ;)
Maybe they will finally understand that they can't sell broken games and get away with it.
Also, Xenohenheim, this is the last Styx game I've ever bought. Broken co-op, broken achievements... and you're talking about testing and "polishing the game" ? !