The achievements are reported in the game card, but apparently they aren't present, some explanation?

have you looked under the sofa?

There are ingame achievements. You can see them in the room where you choose the missions. Just walk to the table and press "R".

I've found them thanks! I've also contacted the creators of the game if they can add the related extra game achievements. It seems there is a good chance of seeing them implemented in the near future.

Hey guys, can you confirm that DEADBOLT has in-game achievements (not Galaxy)?

I'm asking because of this thread: https://www.gog.com/forum/general/ingame_achievements

Yes I can confirm the in-game achievements works fine, they are related to the savegame and give some bonus currency, so if you restart the game you can do them again.

Cool, thank you!