Here is the full list of all 10 Dear Esther: Landmark Edition trophies - there are 4 bronze, 5 silver and 1 gold.
Finish Chapter 'The Lighthouse'
Finish Chapter 'The Buoy'
Finish Chapter 'The Caves'
Finish Chapter 'The Beacon'
Drown Once
Die from falling off a cliff once
Uncover 4 urns
Trigger all directors' commentary
Trigger all voice over points
Walk 5000 steps