Here is the full list of all 14 Submerged: Hidden Depths achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Collect all Creatures
Collect all Diaries
Collect all Boat Boosts
Visit all Landmarks
Collect all Relics
Collect all Styles
Finish the Campaign
Collect all Flowers
Use all Lookouts
Change Hair Style
View a Relic at the Home Base
Change Body Style
Put a Flower in your hair
Change Boat Style