You should probably post this in this thread
https://www.gog.com/forum/general/list_with_gog_games_that_have_ingame_achievements_v2

:)) That was my intent, but I'm having one of those days, when I seem to do everything wrong. And here too I managed to mess it up.

Ahah don't worry we've all been there. XD

Hats off to Wormwood Studios for the blazing fast fix. I was a bit worried about two other achievements that no one else had unlocked, but there wasn't anything wrong with them.

Loop Hero seems to have working Galaxy achievements added and can be removed from the list now.

Thank you, I was aware of that, but I forgot to remove it from the list!

Some not-so-good news:

The achievements of Blue Fire and especially This War of Mine are now invisible. There seems to be no sensible reason for this, since the achievements in both games were working properly. Perhaps we can expect additional updates or DLCs.

Kapital: Sparks of Revolution also no longer has the achievements, but since it was recently released maybe they weren't working yet. If anyone has information please let me know as usual.

Niche has a broken achievement, Globetrotter, bugged also on Steam, and although the developers are aware of it and are responding, for now there is no solution. On Steam it's possible to regress the game to an early version where it worked, but on GOG, given the bad habit of removing older versions of a game from rollback, it's no longer possible.

In "invisible" is meaning "not working" it would be a reason to refund the game since GOG advertized the achievements in this one as well. Someone should create a ticket.

Edit: Just read the OP and apparrently invisible is not the same as not working ... still not good though.

It can be put back on the list again. Latest version 2.0.3.ZERO does not unlock any achievements (version 2.0.2 was actually working). I found the game log file at "C:\Users\{username}\AppData\LocalLow\Cordens Interactive\Vesper\Player.log" and here is what was there:


Requesting Stats and Achievements
(Filename: C:\buildslave\unity\build\Runtime/Export/Debug/Debug.bindings.h Line: 39)

NullReferenceException: Object reference not set to an instance of an object
at GOGStatsAndAchievements.RequestUserStatsAndAchievements () [0x0000f] in <80ac3deea3c64c2f9626603985b32bdf>:0
at GOGStatsAndAchievements.OnEnable () [0x00006] in <80ac3deea3c64c2f9626603985b32bdf>:0


Trying to unlock achievement PROLOGUE_DEATH
(Filename: C:\buildslave\unity\build\Runtime/Export/Debug/Debug.bindings.h Line: 39)

Achievement PROLOGUE_DEATH could not be unlocked for reason: Galaxy.Api.GalaxyInstance+InvalidStateError: No stat data retrieved for user 46987529726874697
at Galaxy.Api.IStats.SetAchievement (System.String name) [0x0001b] in <eea339da6b5e4d4bb255bfef95601890>:0
at GOGStatsAndAchievements.SetAchievement (System.String apiKey) [0x00015] in <80ac3deea3c64c2f9626603985b32bdf>:0
(Filename: C:\buildslave\unity\build\Runtime/Export/Debug/Debug.bindings.h Line: 39)

You just unlocked a new way of dying. You currently have 2 unlocked ways of death.
(Filename: C:\buildslave\unity\build\Runtime/Export/Debug/Debug.bindings.h Line: 39)

Setting stat WAYS_OF_DEATH
(Filename: C:\buildslave\unity\build\Runtime/Export/Debug/Debug.bindings.h Line: 39)

Could not set value of statistic WAYS_OF_DEATH for reason: Galaxy.Api.GalaxyInstance+InvalidArgumentError: Failed to set stat "WAYS_OF_DEATH": increment only constraint not met
at Galaxy.Api.IStats.SetStatInt (System.String name, System.Int32 value) [0x0001c] in <eea339da6b5e4d4bb255bfef95601890>:0
at GOGStatsAndAchievements.SetStatInt (System.String apiKey, System.Int32 statValue) [0x00015] in <103fe6a08e1944dba52155af4d6500be>:0
(Filename: C:\buildslave\unity\build\Runtime/Export/Debug/Debug.bindings.h Line: 39)

On November 29th you said no achievements are unlocking.
https://www.gog.com/forum/vesper/achievements_have_been_added/post2
https://www.gog.com/forum/vesper/achievements_are_not_unlocking

At the time, 5 achievements had been unlocked globally. Now there's no achievement that hasn't been unlocked by multiple players. Maybe what you're experiencing isn't a problem for everyone?
Have you tried contacting the developers?

Correct, that was later fixed in one of updates (could be in 2.0.2 or the one prior). When I rolled back from 2.0.3 to 2.0.2 I had achievements working again.

Yes, and I haven't received any response yet.

In X-COM Enemy Unknown complete pack (Includes Enemy Withn and Slingshot DLCs) following achievements did not unlock at the end of EW campaing with classic difficulty:
Guardian of Earth
An Army of four
Earth First

Kane and Lynch: Dead Men is marked as having achievements, but none are listed. It may be the old problem of invisible achievements because they're set to Development mode instead of Production.

If anyone here has successfully contacted IO Interactive before, I'd appreciate it if you'd report this. I haven't had the best of luck with most game developers.
GOG documentation for achievements mode, for reference.

Unfortunately, all indications are that it's a GOG mistake, there is no trace of Galaxy in the game files, and Dead Men didn't even have achievements on Steam, only on GFWL.
Thanks, these achievements are rare, but not so rare as to suggest generalized bugs. More independent reports would be needed, but I'll definitely keep an eye on them. In the meantime if you feel up to it you could try again, it may have been a temporary bug.
Let me know if they get back to you, I hope to be able to play it before long, so we'll have further counter-evidence.