Cleared the game with all characters (Arcade, Xbox Novice, Xbox 360 modes only).
You have to clear the game with all 3 characters (Asagi, Ageha, Tateha). Continues are allowed so this is an easy one.
Mixed clear (like clearing Xbox Novice with Asagi and Xbox 360 with Ageha and Tateha) is not allowed, so you have to clear a same mode with all 3 characters.
(Thanks Pixie Ninja for your info)
Modes able to unlock this (confirmed): Xbox Novice
Modes able to unlock this (supposed): Arcade, Xbox 360
Modes unable to unlock this (supposed): all other modes
* Changing setting in OPTION -> Game Config disables all achievements.
* Using Restart from pause menu disables all achievements in that play.Related Achievements
(Original/Novice clear with Asagi)
(Original/Novice clear with Ageha)
(Original/Novice clear with Tateha)
[Re-posted after The Site Crash. Sorry, votes and comments to the original solution are lost.