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