Mountain Village - Using the Climbing Axe

Head for the rough stone wall just north of the camp site. Move close and press Interact to set the axe into the rock. Then climb using direction controls as usual. It's not necessary to hold interact to stay latched on. If you need to let go, press Dodge/Roll (Shift/Circle/B) to drop. Now climb the wall up and around to the right, then up a bit more to reach the ledge with the wrecked plane.

Cross over the plane's wing to the area on the right.

Climb the next section of craggy wall (or the ledges to the right) to reach the ledge above.

Latch onto the next section of climbable rock and move to the left.

Then follow the on-screen prompt to lean to the left and jump...

...then press Interact again to latch onto the next section of rock.

Climb to the ledge above, near the wolves' den.