Here is the full list of all 11 TASOMACHI: Behind the Twilight achievements.
Buy all available clothes.
Buy all available furniture.
Collect all Sources of Earth.
Destroy all corrupted Sources of Earth.
Read all of the notes found around town.
Clear the Twilight Sanctuary.
Repair the airship in the Ring Sanctuary.
Restore Gengetsu Lakeside.
Restore Futago Bridge.
Restore Shiokaze Harbor.
Restore Silent Valley.