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