Here is the full list of all 11 Maitetsu achievements.
You can now call yourself the Maitetsu Expert.
Nagi appears to like you now.
Everyone appears to like you now.
Reina appears to like you now.
Kisaki appears to like you now.
Fukami appears to like you now.
Makura appears to like you now.
Paulette appears to like you now.
Hachiroku appears to like you now.
Hibiki appears to like you now.
Completed Test Run of 8620