The Long Dark (UP)

When finding the notes for the caches, you should always read them AND pick them up. I have had problems with caches not appearing on the map because I did not take the note with me. You must find the note before you can locate the cache. I can also confirm that the forest talker caches do NOT affect this achievement. Those caches have an achievement of their own.

Episode One

Cache #1 - There is a burned down school a couple houses down from the back of the bank in Milton. At the back of the building there is a chimney. Look down and you will see a note sticking out of the chimney that will inform you of the first cache location. That location will appear on your map. It is behind one of the houses between Greymother's house and the gas station.

Cache #2 - This note is found inside of a blue car in Milton on the way to the gas station from Greymother's house. The cache can be found behind the church area behind a fallen tree.

Cache #3 - The note for this cache is found inside of a house at the edge of Milton on top of a large hill. It is on the SW side of the town. You can find the cache for this note inside of the cave that is directly behind the radio tower. The cache is in the blue rocks. Keep in mind that this area of the Mountain Town map has changed since the Redux update.

Episode Two

Cache #1 - You can find the note inside of the Carter Dam. The note is on the second floor in the offices. When you come into the room where the first aid locker is, it is on the right from the door in the corner on a desk. It is labeled "Crumpled Note". You can find the cache for this note in Alan's Cave. This cave is on the right side of the map south of Carter Dam near the Hunter's Blind.

Cache #2 - The note can be found in one of the lake cabins on the SE side of Mystery Lake. It is an unlocked cabin that is next to the locked "Cabin #2". The cache will direct you to the clearcut area in the NW area of the map. It is kind of near the destroyed outlook path near a stump and fallen log. Check your map for a more direct location.

Cache #3 - You can find the note for this cache, labeled "Illegible Note" inside of the Forestry Lookout (the one that is not destroyed). The cache can be found near the entrance for Forlorn Muskeg near the rail tunnel.

Cache #4 - The cache note is in Forlorn Muskeg on the railway. At the last crashed section of train, close to the entrance of BR, there is a frozen body with a "Blood Soaked Note" at its feet. The cache is in the Broken Railroad region. When you reach the collapsed part of the tracks, go down onto the river. Follow the river all the way down and you will find it by some rocks on the right hand side.

Cache #5 - This note is easy to spot. Go to the hunting lodge in BR and look to the side of the entrance steps. The note is nailed to the side. You can find the cache by turning around, running across the small pond and go up the hill to your left immediately following the pond. Cache is on the side of a fallen tree that is sticking upwards at a diagonal.

Cache #6 - This note is found in BR. From the maintenance yard, run back up towards the railroad tracks. when you reach the tracks, turn to the right. You should be facing away from the side of the tracks that faces the FM region and instead facing the broken bridge area. You will see a stopped orange-ish train with a vehicle next to it. The note is in the vehicle. The cache is in the FM region. This is another cache that is difficult to explain where it is. Thankfully, you can follow your map marker to the cache. When entering FL from BR, you can follow the edge of ice to get to the cache from the area of the first derailed train.

This is missable. You need to find the 3 caches in Milton before you finish the episode, and you can't go back to Milton from episode 2.

It's been a long time since I got this, but here's a video that should help you find all the caches. I didn't make the video.

Found this video for episode 2, most of it still holds up