This is earned for finding optional collectible #6. 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 4:46:
Once inside Lisbeth's house, go into her room, and then use the door to find a 2nd room connected to it. Look under the pillow of the kid's bed here, and find a drawing. Upon 2nd inspection, take it.
Getting all 6 collectibles in this episode will also reward you with the following: