For this achievement you are tasked with finding all 6 talismans that are hidden around the map. Before attempting this you will need:
Crowbar-found in the garage at the store
Wired magnet-you will need to have a magnet in your inventory, and attach a wire to it. One place to do so is the doctors house.
1) start at Lamothe's and go to the left, along the fence towards the coast. Found in a hole.
2) next to the sign across from the doctors house.
3) east of the store. Right past a tree with a trash bag next to it.
4) just south of 3, under a rock near the totems.
5) south of bedards under a rock near a campfire. Directly under two trees that are crossed.
6) southwest of Roy's, near a campfire and shack.
For a better idea watch the above video. Hopefully this guide has been helpful!