1) When you come across the campsite, check around the campfire to your right.

2) There is a public bathroom behind the campsite. Look for the totem in the men's side.

3) There is a fallen tree to your right just before entering the lodge. The totem's right beside it.

4) You will come across a row of lockers upon entering the lodge. The totem's in the middle one.

5) The next totem is hidden under the stairwell that you will come across after opening the electronically locked door.

6) Upon entering the cafeteria, you will see a microwave oven. The totem's just a few steps away.

7) You will come across a swimming pool shortly after stepping into the woods. Go around it to find the next totem beside another fallen tree.

8) There is a ruined cabin right where you pick up the gas can needed for progression. Look inside it for this totem.

9) Near the end of the chapter, you will reach a trio of tunnels. Before entering the open one, check around the leftmost one.

10) This one may be a little hard to find. It's located near a pulsating red light behind a grate. Always take the right turns after stepping into the sewer system until you come across the totem.

11) The next one is located at a dead end in the corridor with the two tunnel entrances.

12) Look for this one around the control room.

13) Right after exiting the tunnels and before going down the slope, search the ground to your left.

14) Shortly after reaching the first flare upon your path, you will come across a waterfall. Look for the totem at the shores of it.

15) Just before the third flare, you will see a narrow pathway to your left. Take it to find the final totem in front of a decorated slab of rock.

You earn the Forager achievement at this point.
Interact with the said rock to open up a secret area and get the Raider achievement.
(*Note that you need all the totems to be able to unlock this decorated door.)
Explore the area behind it thoroughly to find a dino fossil and unlock the Spineless achievement.