I found this video on youtube, it shows all safespots and collectibles
Its for playstation but the locations of collectibles are the same.
There are a couple of initially confusing cuts in the video, but i found it very helpful and am very grateful to the owner of the video.
I also found a good full map on steamcommunity which helps get your bearings if lost.
(Red = objectives, pink = campfires and white = collectibles)
https://steamcommunity.com/sharedfiles/filedetails/?id=53442...