So if you look at Xenohenheim's profile, he has exactly 3 post here on the forum and 2 of them are in this thread. He's no longer interested in talking to us.
I think both FHE and Cyanide are now deliberately ignoring this problem. This is due to the fact that they've already got our money, so they don't care about our displeasure.
At this point, we may have to switch to posting in the fora for any of their new games that we won't be buying them until they fix Styx. Be sure to mention you'll do what you can to make sure others do not buy their games either.
I managed to get TA to flag the achievement as unobtainable so that the flag shows up whenever the game goes on sale, and at XBA I always mention the game has an unobtainable in the articles they post about game sales that include Styx: SoD.
Maybe if we can manage to affect them financially on future titles, they'll reconsider it being "too expensive" for them to fix "Goblin Master".