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
In the garage once you begin looking for clues about Nathan. Near the front you'll find a nest with eggs behind a wooden plank near the garage door. Move the plank and snap a photo.
Collecting all 10 photos will also reward you with the following achievement: