The latest version of the game "1.08p3", is unplayable without the GOG Galaxy launcher, as mentioned before by this post "gog,com/forum/necrobarista/neverending_loading_screen/post3", so essentially thanks to the log files generated by the game (which are stored in %USERPROFILE%\AppData\LocalLow\Route59\Necrobarista\) we can see the moment things go downhill for the game just right after we reach "StoryEnder.EndStory called" we arrive at " [GOG.Achievements] 'ACH_STORY_E00' " which should display the achievement notification, but since it can't do that the game stays in a dark blue screen after you see the "NECROBARISTA" title in the prologue.

Honestly I have been thinkering with hex editing the save files in order to just move pass that point and unlock all the chapters, but sadly have no results at the moment, I am taking this as a challenge of sorts, to see if its posible to just "fix" this issue, of the top of my head, I could see a situation in which gog servers could be down or your internet connection could be non existent, so the achievement process could fail.

Also there was this other case in which using a Steam Deck with the game launcher "heroicLauncher" and Proton had the same issue "gog,com/forum/necrobarista/proton_heroic_launcher_stuck_at_the_intro_cinematics".

So far I am hoping to find some help in order to approach this game breaking "bug", any advice is appreciated, and yeah you could always use GOG Galaxy and that would be the end of that (hopefully) but I see this situation as a dangerous one, the moment your internet fails or the launcher stops supporting your OS, well the game is lost basically.
I can't post links sorry, please replace the " , " (comma) with a " . " (dot)

-The HEX editor workaround-

Well, I somehow managed to get pass through every achievement bug that happens in the game so far, here is how I did it:

1. Go to your savefile location on windows is "%USERPROFILE%\AppData\LocalLow\Route59\Necrobarista\StandaloneSaves\Necrobarista.save

2. Backup your saves just in case

3. Delete the file "Necrobarista.backup"

4. Open a HEX editor, it can be an online one like -> hexed.it

5. Drag & drop your "Necrobarista.save" file in your editor of choice

6. Search for the following -> "_md5":
[You should find something like this -> "_md5":"62a8c1a22f5a5db4a0779447524e1bbf"]

7. Set the "_md5" value to zero

This md5, contains inside quotation marks ("") a value that we have to set to 0 (zero) in order for the changes that are going to be made in the savefile to work when the game loads it

8. If done correctly it should look like "_md5":"0"

Now we can make the changes that we need.

The game has different slots for your saves, there is a "SessionData" slot (basically your autosave that happens when you quit the game by pressing start and choosing "Quit", and the "_bookmarks" slot that contains the saves made by you manually, all of the slots have something called a "ShotIndex", this is what we need to edit in order to move past the achievement bug

9. locate your "ShotIndex", could be the one in your autosave (SessionData) or in one of your Manual saves (_bookmarks).

10. According to my tests, in the prologue, after the "NECROMANCY" words show up, your save (manual or automatic) will be stuck at -> "ShotIndex":53 , you have to basically sum +1, to that number so you get a -> "ShotIndex":54 , and then export your save out of the HEX editor, and place it in your saves folder

11. Launch the game and load your save (if its an automatic save, just press continue in the title screen)

12. If it worked you should have moved past the scene.

Notes.:
The reason why i don't consider this a "fix" is because esentially we are skipping any scene from the game that triggers an achievement, so you need to open a walkthrough to check what you missed in that scene.

We can continue playing but there are a total of 11 achievements in the game for both GOG or Steam, and everytime an scene that triggers an achievement happens, well, you have to do this whole process again, locate your "ShotIndex" value and sum a +1 so that by the next time you load your save you will be in the next scene.

I do not know what other route I could take to fix this problem, esentially there needs to be a way to stop the game from executing the [GOG.Achievements] function and so far in the savefile of the game I haven't found anything related to achievement values, so my options are:

>Making a mod for the game (The game is made in Unity, don't know where to begin)

>Using cheat engine (I would need to edit a whole bunch of stuff and see what happens plus you will need to learn how to use cheat engine)

>Edit the .exe of the game (Yeah, no clue if that would be a good idea, is just a guess)

It's baffling to me how a whole game breaks apart just because an achievement is not triggered, but well, I hope this helps anyone in a similar situation, and if you might have a better solution or a clue as to what needs to be edited to fix this, please share your ideas, any help is appreciated.