
After making your way past the canyon avalanche in the first section, climb into the cave at the top of the hill.

Follow the tunnel to a larger wall of ice with a deep chasm below. To unlock the "Tibetan Osteopathy" achievement/trophy, you must "break the ice wall with your back and survive." Start by walking to the top right corner of of the ramp overlooking the chasm.

Turn around so Lara's back is toward the ice wall and save the game.

Backflip into the ice wall to smash through it.

Slide down the icy slope beyond. A bit more than halfway down the slope, press Jump + Roll to spring off the slope and somersault in the air, then hold Action to grab the climbable wall on the other side of the deep pit.

Climb upward then right until you can drop down in the doorway.

The achievement/trophy should unlock here.
- OR -

If you don't care about achievements, instead take a running jump off the ramp...

...crash through the ice wall...

...slide briefly, then jump across the deep pit and grab onto the climbable wall.

Climb upward then right until you can drop down in the doorway.
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