Firewatch
10 Achievements
4-5h
Ol' Shoshone
Listened to the tape of "Ol' Shoshone." Cavorted among the aspens.
4.3%
How to unlock the Ol' Shoshone achievement in Firewatch - Definitive Guide
In the above photo, is where you need to go to find the recording. Just before you get to it, will be a dead elk. Nearby is some bushes you use to move out of the way, then you will need to clear the way with your axe. Once through, you will see a chair, and some other useless junk, except for a note with a tape on it. Simply pick up the tape. I didn't even have to listen to it.
Also, directly east of this location, will be an outhouse. Go past here and you will find a destroyed lookout called Hawks Rest. Enter and go downstairs. Go over to the stove and interact with it for another achievement The Life and Times of Racoon Carter.
Let me know if there could be any changes to the guide.
If you head north from your tower and follow the trail to the cave, and then head north out of the main cave entrance. Once you see the old abandoned outhouse head to the west of that area. You'll see a dead elk and beyond that are some bushes you'll need to push through. Just beyond that will be the part that needs the axe to clear it. Once through there you'll see a small clearing with a bench and a chair. The tape is on the bench. Pick it up and hold "B" to keep it. The achievement will unlock after that but you'll never actually to hear the song.
I made my way back to the tower. Saved the game. Quit to Desktop. Restarted the game and loaded the same save. Upon doing so, on the desk in front of me was that same tape. Picking it up this time, popped the achievement.
This trophy can be obtained as early as Day 77. After unlocking the The Life and Times of Raccoon Carter trophy, leave the Old Cabin and head directly west. You will find a Gap In Bush there that you can press to make a path through the bushes. Now look for a Blocked Trail in front of you and use the Axe to chop it down with . You will find the following items: A Rusty Seat, Empty Bottles, an Old Note and a Cassette Tape. Pick up the Cassette Tape with , then press and hold to keep it and unlock the trophy.
Below is a photo of where the Raccoon is located at:
From your tower, head down the path behind to the cave. On the far side, follow the wires as per Day 2 until you see a sign stating Beartooth Point / Thorofare Fire Lookout (if you've gone for the Raccoon Carter trophy first, just retrace your steps to the above sign). With the sign in front of you, head left (west), past some big rocks to some overgrowth which you can cut through. Pick up the cassette on the bench and hold to keep it. Trophy unlocked.
This can be completed as early as Day 77. You will need the axe before you can complete this. The axe is obtained on Day 76.
When you start Day 77, head north toward Beartooth Point. About halfway there (between the words "Thorofare Trail" and "Telephone"), the trail splits once and then again. At the first split, head left and search in the western area for bushes you can push aside and then roots you can use your axe on. In this area is the recording. The achievement unlocks when you keep the tape.
Here is the video guide: