Challenges and chests | Siberian Wilderness Rise of the Tomb Raider Guide
Chest 1

Semi auto pistol element - after the fight with the bear, in the cave, before the entrance to the Glacial cave.
Chest with coins 1
Chest
Near the blocked passage, close to the Monolith.
Chest with coins 2

Under the fallen tree, among the small trees.
Chest with coins 3

Close to the camp, at the end of the side-road .
Challenge- Grab and Run (Loot 3 corpses)

To complete this mission, you only need to kill the soldiers of the Trinity, approach their corpses and loot them.