Hidden by the Trees achievement in Alan Wake 2

You will need to progress the main storyline until you unlock the screwdriver and boltcutters before you can access every area of the game. Once you have them you can use the car to travel to the 3 maps and collect everything.

Cauldron Lake
8 Alex Casey Lunchboxes
5 Cult Stashes

Watery
6 Alex Casey Lunchboxes
8 Cult Stashes

Bright Falls
7 Alex Casey Lunchboxes
9 Cult Stashes

Video guide to all Lunchboxes, cult stashes, & nursery rhymes.