This is earned for finding optional collectible #1. 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 0:59:
Upon reaching a camping spot, and gathering logs for the fire, Daniel with go to the creek and try to catch a fish. After being unsuccessful, you should be able to spot an odd item in a tree nearby, and boost him up to it after inspecting it, revealing the first collectible.
Getting all 6 collectibles in this episode will also reward you with the following: