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