The Saki & Kyousuke Character Pack Add-on for 100% Orange Juice has 6 achievements.
Play 10 games as Saki (DLC 2)
As Saki, KO at least 2 other players with one Big Bang Bell you have set (DLC 2)
As Saki, KO only yourself with a Big Bang Bell you have set (DLC 2)
Play 10 games as Kyousuke (DLC 2)
As Kyousuke, KO 5 characters in one game while using Cast Off (DLC 2)
As Kyousuke, KO the same male character 3 times in one game while using Cast Off (DLC 2)