Here is a 100% walkthrough of Chapter 7: How Much is Enough including all the secret locations and the missable achievement
Undaunted.
Secret / Collectible #1 - 0:28
Secret / Collectible #2 - 2:06
Secret / Collectible #3 - 4:00
Secret / Collectible #4 - 6:13 (Undaunted Achievement)
Secret / Collectible #5 - 7:39
The Undaunted achievement in Unravel worth 69 pointsFind the secret in the crushing, zapping death machine