Here is the full list of all 22 Sword of Asumi achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Saved the World and fell in love #1
Completed Hikari's Unrequited Love Ending
Saved the World and fell in love #2
Saved the World and fell in love #3
Impress Kami with your poetry skills
Killed Utsuro at the End
Completed the Dying Alone Ending
You Spread Rumours about Hiro & Jiro
Get a perfect score in Tactics with Sen
Completed Death of Hikari Ending
Assassinate the kidnappers after they talk
Suggest to Kaori she is your type too
Completed the 'canon' ending to the game
Completed Mercy is for the Weak Ending
Saved the World and fell in love #4
Came first on the Obstacle Course
Skipped the intro on second playthrough
Kill Everyone in the intro
Completed the entire game at least once
Killed Mineko at the End
Try a little cosplay with Kaori
Drug the Principal for Information