RawSteelUT: Hopefully this place doesn't go away and have everyone not interested in Steam going back to the abandonware mines, but considering the gaming industry is intrinsically toxic, I see it as only a matter of time.
This is probably true. A bigger issue than GOG itself is that, as Stinging Velvet said, most people simply don't care about DRM (but I would add, except for in cases where it is performance-impacting and/or extremely intrusive, like Denuvo... that kind of DRM do have considerable backlash against it even among people who otherwise don't care about DRM).
That reality means that any kind of DRM-free store is always going to be a very uphill battle, and probably a losing battle in the long-run.
As for the anti-Achievements comments: if Achievements are so unimportant, then why do WayForward's Steam customers always get them, but yet their GOG customers don't? They must think Achievements add value to their games given the fact that they include Achievements for the Steam versions of their games. So why do their GOG versions deserve less value?
And anyway, regardless of whether or not Achievements are good, either way, it's still unethical and lazy for devs not to give their customers on each platform feature parity whenever possible, which when it comes to Achievements, it is possible, and the only reason why WayForward excludes them is because they simply can't be bothered spending a few hours to do the work which would result in GOG customers receiving equal treatment and full feature parity...and yet they still want(ed) GOG customers' money anyway, in the same equals amounts as on other stores where they do put in the work and give the game 100% of its intended features; that doesn't add up and that's not acceptable IMO.
As for the idea that no one needs Achievements because everyone can "think up their own goals and objectives," well if that be so, then one could just as easily say the same thing about the act of playing video games; by that logic, there is no reason to do it because the purpose of playing is to fulfill game-related goals that could have instead been imagined in the mind.