is this the one? i forget how i got it, but i believe it has to do with the hinterlands expansion. mostly it has to do with the cemetery, it has a number of different ways that can play out in the last day, but it could also be the scene you return to the colonel state after doing the burial task.
Thanks to this, I was able to unlock the achievement. Then things turn differently better when meet the sister in the church beforehand, and when you go to the pond and get the Shed scene. Adds a friendlier dialogue and fear to P
I did Second Church > Skinned Tapir quest > non-fiction > shed > cemetery