I missed going to the bathroom in one of the chapters early on by accident, so I replayed and backed up my save right before I hit the last bathroom.

BACK UP YOUR FILES FIRST!!

C:\Users[USER]\AppData\LocalLow\Umanimation\Dordogne

https://www.dropbox.com/scl/fi/ysfcklbw589kxfwkd5z5o/DordogneSavedData.uma?rlkey=b4kesj5ueero6oid8oi8do50f&st=6tzxs85y&dl=0

Note: You may have to copy and paste the link into your browser to get to Dropbox properly. Clicking through steam sometimes returns a 400 error for the file for whatever reason. Once on dropbox, hit the download button to get the save file. It will look like nothing is there on the Dropbox website because the file type is not "viewable" like a document would be.

Throw the save into the path above, load up the game, go to the bathroom and you're all set.

I have not tested that the achievement will unlock on another account when using this save, so if you run into any issues, please let me know!