Weird West: Definitive Edition

This achievement can only be earned on Chapter 5 as an Oneirist, as she's the only one who can decipher the Stone Stele's. There's 3 stone tablets to decipher in total and here are their locations:

1. Cedar Flats - Just sat in the main street opposite the jewellery store.
2. Horsetail Grotto - Behind the cave, found among some old temple ruins.
3. Blood Moon Temple - Behind the temple entrance in some further old ruins.

See the video for a more accurate location:

In cedar flat, horsetail grotto and bloodmoon temple, there is a stele you can interact with (in horsetail and bloodmoon temple, it's in the outer area, and in cedar flat it's in front of the first house on the left when you come in town)

You'll wanna be the fifth character when you do this as she is the only one who can interact with them properly.