IMO it's not "strange" (at least, not if "strange" means that it's a "new" thing) that Galaxy Achievements work for some people with some games, yet those same Achievements don't work for other people with those same games.
I've noted examples of that in posts I've made earlier in this thread, including when it's happened years ago, and I think others have also noted the same thing, also going back years.
I have seen some evidence that Achievements are somehow tied to the structure of your saved games' data, but I don't understand how any of the technicalities of that works.
I have a theory (just from what I can infer from my experience with non-working Achievements for me, but which sometimes work for others, and also from reading the posts in this thread about other customers' experiences with non-working Achievements); my theory is that sometimes certain customer's saved games somehow have their saved games' data get in such a way that GOG's Achievement-processing system can't read the data properly.
But one thing that doesn't make sense about that theory, is that even when I started a brand new saved game, in Mad Max, for example, one of the Galaxy Achievements that you can get shortly after starting the game still didn't work for me even with a brand new game either...which means my saved game wouldn't have had time to become "corrupted," and therefore another factor is surely occurring that is preventing that Achievement from processing properly for me.
I've also posted similar problems with other games too, and then some people have said they have the same problem with those same Achievements, yet others have said they had no problem and they had earned those Achievements correctly.
These matters need more research so that we can finally get to the bottom of what is really going on.
One thing is certain though: a particular Galaxy Achievement working for some customers is no guarantee that the same Achievement will also simultaneously be working for all customers. Sometimes the very same Achievements that work for customer A, do not work for customer B, and that's not a "new" problem at all.
Post edited Yesterday by Ancient-Red-Dragon