Here is the full list of all 22 Grow: Song of the Evertree achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Inspect 20 villagers
Unlock the Mountainside Ward
Unlock the Valley Province
Use the Watering Can on a bed
Unlock the River Precinct
Create a Perfect World Seed for each World type
Unlock the Forest Region
Complete a relationship character to the "Friend Ending"
Unlock all building blueprints
First Accident World Seed created
Build 20 buildings
Unlock the Plains District
Befriend 5 critters
Have 10 residents leave town
Talk to 20 villagers
Complete first district requests
Turn 100 items into Essences
Assign first villager to a house
Kick around items in the Gnome House
Walk a total of 1,000 miles
Walk 500 miles
Unlock Book