Here you can find a guide for all collectibles at the following link:
https://steamcommunity.com/sharedfiles/filedetails/?id=18986...I am not the author, so all credits to pschlik (
https://steamcommunity.com/id/pschlik).
(The guide is actually for TSW 2020, but it works just as well for TSW 2).
If you have any questions or need help with TSW 2020 or TSW 2, you can always contact me directly.