Here is a 100% walkthrough of Chapter 5: Off the Rails including all the secret locations and the missable achievement
Pathfinder.
Secret / Collectible #1 - 1:34
Secret / Collectible #2 - 2:45
Secret / Collectible #3 - 5:08
Secret / Collectible #4 - 7:28
Secret / Collectible #5 - 8:55
Pathfinder - 1:34 to 3:21
The Pathfinder achievement in Unravel worth 86 pointsMake it to the water wheel without using a log raft