The Mountain #1
Head inside The Mountain from the base, where you dispel the Black Breath and then complete the sand bowl puzzle. This will open a path to the right, take this and you’ll come upon a large bridge. Defeat the Revenant and Nightmares before passing over the gap. Turn around and face this gap to find the Raven on the beams below.
The Mountain #2
Head to Brok’s Shop at the Heart of the Mountain and then walk to the cliff edge just outside. Look into the air to spot the Raven circling around in the sky.
The Mountain #3
When you find the mine cart that can be pushed in the Heart of the Mountain area, access the upper walkway and cross the bridge. Follow the path to the end and defeat the Draugrs to find the Raven in the wall across the gap.
The Mountain #4
Return to The Mountain once you have the Magic Chisel and open the Hidden Chamber. Head inside and defeat the Valkyrie Eir in the central chamber. Once she’s dead, look above the brazier to find a Raven perched on the wall.