This achievement is earned for finding optional photo #8. If missed on the first run, you can "Play Episodes" and select specific parts of the Episode in order to find the missing optional photos through collectibles mode. The following collectible is described and can be seen below:
] - Optional Photo #8
Once inside the barn, find the hatch, then make Chloe boost you upstairs. Once at the top, find an owl sitting on a haystack in the corner of the top floor.
Collecting all 10 photos will also reward you with the following achievement: