300 Combo
This trophy is unlocked upon clearing a song in which the maximum combo reached during the song has reached 300.
This trophy requires you to hit 300 tap notes in a row without missing one, and obtaining a clearing grade. This can be done on any song on any difficulty, provided the number of notes during the song is not less than 300. The trophy will be unlocked following the completion of a song in which the combo counter has reached 300. Unlocking this trophy will also unlock ???100 if it has not been unlocked already.
Credit to HighflyerVII