Here is the full list of all 39 Spiritfarer achievements. It takes around 35-40 hours to unlock all of the achievements on Windows.
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Discover all recipes
Complete all collections
Collect all figureheads
Do not tell Astrid about Giovanni's night excursions
Give a dating advice
Sign up to Feedorama
Accomplish your very last objective
Light up all Lighthouses
Activate all the shrines
Bring all releasable spirits to the Everdoor
Fully improve Elena's Cubicle
Make all spirits reach the ecstatic mood at least once
Sell at least 200 items
Build all houses and stations at least once on the boat
Fully improve Buck's Lair of Wonders
Use Alex's bus stops 50 times
Endure 10 of Albert's jokes
Have your final conversation with Hades
Fully improve Gustav's Gallery
Complete thirty errands for Francis
Fully improve Astrid's Bungalow
Fully improve Bruce and Mickey's Crib
Fully improve Atul's Workshop
Find and shelter all sheeps
Have your second conversation with Hades
Fully improve Stanley's Playroom
Shear sheeps at least 50 times
Tell Astrid about Giovanni's night excursions
Buy at least 100 items from Raccoon Inc
Complete twelve errands for Francis
Fully improve Alice's Cottage
Have your first conversation with Hades
Make 5 spirits reach the ecstatic mood at least once
Fully improve Summer's Sanctuary
Fully improve Gwen's Lodge
Complete one errand for Francis
Give Furogawa Tour's guide a tip
Make one spirit reach the ecstatic mood at least once