Here is the full list of all 12 Retro Mystery Club Vol.1: The Ise-Shima Case achievements.
Ask for Ken's alibi until the text line stops changing
Play Ninja Kai and get a score higher than 1500m
Clear Tokyo
Make Reiji Hamazuki remember the name of the victim
Listen to Akiko's life story
Find who the receptionist is at Le Bijou
Wait a few minutes for Kana's towel to fall off
Get Tamami alone in the bath with you
Wait a few minutes for Tamami's towel to fall off
Check the Italian restaurant's rating
Find some treasure in the abandoned factory
Finish the game