unfoldgames: Hey everyone! DARQ dev here. My apologies for the delayed achievement implementation. There wasn't enough time to implement Galaxy achievements before launch, so it had to be postponed. I'm happy to let you know that I'm now working on it and the achievements will soon come to GOG.
And yes, the upcoming DLC's will be released on GOG as well as Steam (at the same time), for free. They're coming later this year.
Thank you for your support!
I bought Darq recently, but I've held off playing it since you mentioned achievements are coming soon. Do you have a sense for when they'll be available?