Difficulty: Medium
Updated: Sept 2024
There are approximately 13 locations in Mystery Lake and 26 locations in Coastal Highway that you need to enter in order to unlock this achievement. The number fluctuates as several sites have spots that may spawn buildings or may spawn destroyed structures.
I've created a Google Sheets checklist accessible here with a map of my suggested optimal pathway:
https://docs.google.com/spreadsheets/d/11EFKeqkrlL98dUex5xMp...Mystery Lake Region*** Spoiler - click to reveal ***Carter Hydro Dam
Main Building
Trailer 1
Trailer 2
Mystery Lake
Camp Office
Cluster 1 (1-2 cabins)
Cluster 2 (1-2 cabins)
Lone Lake Cabin
Southeast Corner
Trapper's Homestead
Unnamed Pond
Cabin
Forestry Lookout
Forestry Lookout (Does not feature a loading screen to enter but forum comments suggest this is required.)
Logging Camp
Trailer 1
Trailer 2
Trailer 3
Coastal Highway Region*** Spoiler - click to reveal ***Train Unloading
Trailer 1 - Right side towards end of tracks near the Train Unloading location trigger
Trailer 2 - South of Trailer 1 after crossing a small bridge
Cabin - East of Trailer 2. Head towards CH interior but stay north.
Rabbit Grove
Fishing Cabin
Fishing Camp
Cabin Outer - West and a little north of the Fishing Camp
Fishing Cabin - Work bench behind this one
Cabin 1
Cabin 2
Cabin 3
Jackrabbit Island
Coastal House
Misanthrope's Homestead
Coastal House
Waterfront Cottages (3 possible structures)
Cabin 1
Cabin 2
Cabin 3
Coastal Townsite
Quonset Garage
Houses (Garage side of street) - 7 possible sites
Houses (Coast side of street) - 1 guaranteed, 3 other possible sites
Coastal House - West of the townsite on a slight hill
Trailer - North of the Coastal Townsite
Abandoned Lookout (4 possible structures)
Cabin 1
Cabin 2
Cabin 3
Log Sort
Coastal House
Trailer 1
Trailer 2 - North of the Log Sort, up a hill and slightly east
Abandoned Mine
Cinder Hills Coal Mine
Notes: The prepper's cache in Mystery Lake is NOT required. Neither are cars or fishing huts.