Go to the indicated locations in Chapter 10 to knock over all 16 rock cairns (rock piles) with your vehicle and get the "Not A Cairn In The World" trophy. Simply drive over them and they will fall apart. At certain points in the mission, you cannot go back. This means you must get them in the correct order or you will have to start over again by replaying the chapter. The cairns can be found at the following locations (in order):

1. In front of where you start.

2. In the larger area shortly after the start (area with waterfall on the left).

3. Same area as previous cairn, but at the end of the area (where you drive up the mud).

4. After driving up the mud, before the wooden bridge on the left.

5. After crossing the wooden bridge on the left.

6. Shortly after passing the bridge, you drive up a muddy hill. After that, you reach a new area with a small river and you must drive up a large rock. On the rock is a cairn.

7. After driving up the second rock on the right (same area as previous cairn).

8. You will drive down a muddy hill and see some ruins in front of you. Before the ruins on the left is a cairn.

9. After the last cairn, you jump down a little rock and reach a relatively small circular area. At the end of this area is a cairn.

10. In the area after destroying a wooden bridge with the winch. When Sully talks about Nadine.

11. In the very large area on your way to the beacon. It is at the start of that area, after you see some trucks driving away in the distance.

12. Same area as before, further up the hill.

13. Same area as before, on the hill on the left side with the manmade sculptures.

14. Same area as before, near the top of the hill (but before the beacon). This is the best hidden one, as it is standing in some tall grass and hard to see. It is just before making a right turn to the hilltop with the beacon. To the left of it is a path that leads to a village with enemies.

15. On the hilltop where the beacon is located. In front of the beacon.

16. After the second beacon/tower, on the right side of a cliff. You will drive right past it.