This is earned for finding optional collectible #5. 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 in the video below at 4:58:
Once you spot on the beach, and Daniel is playing with the dog, pick up the stick at your feet and Play Fetch
. The dog should bring back the stick with a collectible attached to it.
If this doesn't work, throw the sitck to the left.
Getting all 6 collectibles in this episode will also reward you with the following: