Geothermal Valley - Quiet Times Achievement - "Best Seat in the House"

Start at the building nearest the monolith, southeast of the Ruins Encampment Base Camp. Go around behind the building.

Enter the room where you found the 5th relic.

Jump off the wooden ramp next to the box that held the relic, and use the tree branch...

...to swing over to the next building.

This is the upper level of the Remnant herbalist's tower. You can see her working below.

Hang from the inside edge, climb to the right, and pull up next to a folding chair.

Sit here to admire the view and unlock the achievement.