Now that we have the Rope arrows in our possession we can nab the remaining collectibles in the Siberian Wilderness area. Use a Base Camp to fast travel back to the ‘Wilderness Refuge’ Base Camp in the Siberian Wilderness map.
You’ll find a cave blocked by rope-covered planks just west of where we found the Explorer’s Satchel earlier in the southwest corner of the map. Inside this cave you’ll find a chest containing a Relic [02/03 – Archer’s Ring] and some Mushrooms .
A little further to the west is another cave entrance blocked by an impact barrier – shoot this with your firearm of choice to bring it down. Within you’ll find two veins of Magnesite Ore , a box of reagents, some Mushrooms and a chest containing a Relic [03/03 – Mongolian Tug].
This should be your 100% completion in the Siberian Wilderness region. Make your way to the nearest Base Camp to fast travel out of there!