Go almost halfway across the walkway and hang from the left edge. Traverse close to the metal ring, release and quickly throw the Grapple cable to catch the ring.

Climb down a bit and wall run to reach the ledge on the left.

Grab the wall and pull it. Keep pulling until you pass the first column on the left.

Stop somewhere between the first and second pillar. That way, you will leave some space for Lara to go around the wall and reach the other side (behind the wall).

Do that, grab the wall and push it to the end (until Lara stops).

Use the Grapple to catch the metal ring on the wall and wall run to reach the ledge in the middle of the room.

Go left and jump the gap.

Climb up the panel to reach the circular platform with the empty pedestal.

Cross the walkway and go left behind Thor's left shoulder. Pick up the Relic and return back to the circular platform.