There are some cool and cute side explorations you can do/read/examine - but this vid touches all the must do actions to complete the game.
Chapter 2 - Survivors of Adversity - 04:40
Chapter 3 - Peculiar Petals - 18:00
Chapter 4 - Botanical Allies - 34:30
Chapter 5 - Climbing Up - 57:55
The Windmill Wort - 00:15
Fulguria - 08:09
Ash Plume - 12:12
Priest Holes - 19:38
Pixie Tears - 22:40
WolfGlove - 27:27
Sapphire Gloom - 36:40
Nightfall - 41:10
Cradle Fern - 46:06
Brook Chalice - 50:12