This achievement is earned for finding optional photo #2. 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 #2
Outside, look at the trash, interact with the donut, walk away from the bench and return to take a photo of the squirrel.
Collecting all 10 photos will also reward you with the following achievement: