Fictorum has received an unknown update that may or may not have fixed the problem with the achievements. If someone plays it let me know.

Multiple achievements for Shadow Man Remastered didn't unlock for me after installing the new patch and launching the game. A good amount of them did unlock but the ones I marked red in the screenshot didn't even though I completed all of them.

Another small update from me:

Raji: An Ancient Epic
Favor of the Gods
Raji and Golu

I've contacted the Devs via Discord and Email, but it has been a month without any response.

Legend of Keepers
GOG version is missing 13 achievements. GOG (11) vs. Steam/Stadia (24)

I sent a ticket to support, they acknowledged it as a backend publish bug, but so far nothing has changed.

Stronghold Warlords

Not bugged per se, but I have noticed that ALL unlocked achievements have been wiped. I contacted the Devs but still waiting for a response.

Thank you, if nothing else, they are among the few who have kept their promise to add achievements after launch. Do you know if those achievements are unlocked by replaying the necessary parts? In that case, while extremely annoying for those who have already completed the game, I wouldn't consider them completely bugged.

And thanks again to you, Aslaat, I will update the list accordingly.

Regarding Stronghold Warlords, I know for sure that the developers have the power to reset the achievements of all users, because it has already happened and I think it's also explained in the official Galaxy documentation. They probably made a mistake and I don't think there's any way to restore them with the original unlock dates.

As always let us know if there is any news!
Yeah, on their website they have an email for support but they never answered me, if you have time you could try to write them too, or try to contact them on Discord. Who knows if they will ever fix this bug.

It should work when you have save files available that are not right before the final boss fight. I did the final boss fight again for example and beating him again unlocked the "I am the Lord of Deadside" achievement.

Some achievements that are still locked for me would only unlock on a new playthrough since I've no second chance to complete the needed task (Finding the L'Eclipser, opening a Soul Gate, defeat a True Form) due to only having a save file right before the final boss. The earlier in the game your save file is the better.

Good idea. However, it doesn't look good. I tried to submit a support ticket, but... see the screenshot

Yeah, it doesn't seem to work anymore, you can try the support of the publisher Modus: https://modusgames.com/support/

Thanks, man. Really nice of you to look for an alternative way to contact them. And this one worked. I also mentioned their bearwithmegame.com support link is broken in my, as they say, SOS.

Very small update:
I received reply from Firefly Studios:

"Hi,
Due to a technical error, all Achievements were reset on the Galaxy platofrm. Unfortunately we have looked into this and have no way of recovering the lost data.
Galaxy have told us though that any players that contact them with a list of achievement can have them reinstated manually.
You can contact GOG support here: https://support.gog.com/hc/en-us?product=gog
Sorry for the inconvenience this may have caused."

So, we have missing achievs, broken achievs and now resetting achievs? -_-'

No problem! Hopefully they can fix the bug.
As I feared, unfortunately GOG support can't unlock them with the old original unlock dates, but better than nothing.

You forgot the invisible achievements, next will be the shape-shifting achievements.

Mad Max has an achievement, 'Up to the Task' that can't be completed normally anymore due to the servers being taken offline, which were required for two of the challenges. But it is theoretically possible to get this achievement by using a save game from Steam:
https://steamcommunity.com/app/234140/discussions/0/2592234299562834210/