There are 6 optional collectibles in Episode 5: Wolves. Each optional collectible will unlock a specific achievement / trophy. If you have completed the episode, you can go back to specific chapters in collectible mode and not affect your decisions in the episode. Here are the timestamps for the collectibles:
0:32 - #1 The Magic Place
1:32 - #2 The Age of Reason
5:21 - #3 She Wolf
6:00 - #4 Remorseful
6:52 - #5 Dead Man's Bones
7:50 - #6 Boundaries
Here is a video guide with English commentary!
Here is a playlist of guides for this game!https://www.youtube.com/playlist?list=PL-HeW6XkKdUJNaduS4UQz...