Complete the indicated task to unlock the achievement.

Achievement	How to unlock
Donnelley	Finish Chapter 'The Lighthouse'.
Esther	Finish Chapter 'The Caves'.
Jakobson	Finish Chapter 'The Buoy'.
Man of the Rocks	Walk 5000 steps.
Mullach an Eilein	Trigger all director's commentary.
Paul	Finish Chapter 'The Beacon'.
Seanchaidh	Trigger all voice over points.
Seonaidh	Drown Once (Secret)
Stac an Armin	Die from falling off a cliff once (Secret)
Tuir	Uncover 4 urns.