After the first playthrough, two achievements are not yet free. To get them you have to do the following.

Secret Achievement: The Curse Yet Lingers
Fill the Sprite Viewer with 7 S h i t o u -kuns.

In short: Tools -> Sprite Viewer ->



show all 7 "S h i t o u -kuns"


Achievement appears

2. Secret Achievement: Sports Fan
View an FC Match in the Gallery.

In short: Extras ->



Go to ->



Open one of the FC battle replays.
Achievement appears.

Once you have done both, the last Achievement will appear.

Aokana 2: Electric Boogaloo
Get all Achievements

Good job :)

My biggest thanks goes to "Beelzemiss" and his Guid: Secret Achievement (°ロ°) to Aokana - EXTRA1. It helped me a lot and inspired me to write a guid myself.
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=2354346659