Here is the full list of all 16 Spirittea achievements.
Spend one year in town.
Catch all of the bugs.
Collect all of the figurines.
Catch all of the fish.
Get an "S" ranking in all karaoke songs.
Beat an NPC at the drinking minigame.
Fully renovate the bathhouse.
Become close friends with everyone in town.
Finish writing your book.
Help Wonyan remember his duty.
Discover the secret shop.
Buy a bicycle.
Fix the bridge to the mountain.
Fully serve a Lord Spirit.
Leave the little town in the countryside.
100% complete the game.