[2022] CTD loading a game (Script system error! - ep1_achievements.txt line: 40)

Is this in saves from before the 1.5 patch, so started under the 1.4.x patches? Or started under 1.5?

If under 1.4.x , you should revert to that version in the Steam Betas tab to complete any such campaigns.  

In your clean reinstall of the game, did you make sure there are no files or folders left under either the Steam CK3 or Documents CK3 locations, before installing again?

Because otherwise I have no explanation why this is happening to you, and so far as we know only you.  

Corvic said: Error log is still blank.

But you said these errors were in the error log? I'm not understanding something here I think ...

What if you make a new Windows user on this machine, log into Windows with that, and try the game there?  

It is hard to see how getting an achievement does anything to the save game file, as so far as I know the fact of having got the achievement is not stored in the save file at all, only in your Steam account.

What is the issue with non-Ironman saves and the Resume button? Is it that they do not show there? Or they show but won't load?

What launcher version do you see now? Current is 2022.3  

Corvic said: Yeah, I guess I was wrong, now getting a CTD loading a non-ironman saves.

Only from Resume? Or also from the Load menu?

Either way is pretty inexplicable, but ... !  

Not inconceivable, but it's not happening to everyone. What if you delete the three 'cache' folders under Documents/Paradox Interactive/CK3 ?  

Corvic said: There are no files present.

I'm not sure what you mean here; under Documents/Paradox Interactive/CK3 there are folders cache, terraincache and shadercache, yes?