StuthuIhu: Will there be any?
I don't think that there will be any achievements, but unfortunately that is a recurring issue in most games released on GOG. A lot of people tend to blame the developers, but from the looks of it developing stuff like achievements for GOG galaxy is harder than for other platforms like Steam. For larger teams it might be easier to devote time to those aspects, but when you are a smaller team that has to satisfy a large publisher (as is the case now) and release a game with as little issues as possible so you can increase your sales and keep the suits happy, it might not be practical to devote that extra time when you could be working on an important patch. Add to that the fact that the crowd size on GOG is much smaller than on Steam and it becomes quite obvious why not a lot of smaller indie titles don't have achievements on GOG but have on Steam.
I really don't think that not having achievements is a big deal. I know that most people have an issue with the lack of achievements more from a moral standpoint - If I'm paying the same as a steam costumer why can't I get the same features? But if we continue to support these titles on steam we will be able to demonstrate that this is a platform investing in. I personally much rather have a DRM free game that I can play anywhere at any time, without a laucher, activation and sometimes downright spyware, than getting a ping everytime I collected 50,000 medals in one run. It's a nice pat on the back, yeah, but a useless one. This game has a lot of promise to it and I would 100% rather support it on GOG.
Anyways I've gone on for too long, I hope you get it on GOG and enjoy your game :)