Here at TrueAchievements, we like to keep you informed on as many date-specific achievements as possible. Next up on the date-sensitive hit list is Memories Off: Yubikiri no Kioku
and the Chinese Version
of the title which both bare a date-specific achievement in each that players can unlock tomorrow, December 1st.
Once you reach the main menu of the each title, the game's achievement will unlock. It's as easy as that! Celebrate Shina's birthday any time tomorrow to unlock the achievements.