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