Credits:
Beat One More Extra Stage.

Dancer options:
Play any course in Nonstop mode.

Endless mode:
Get 100 A's.

Mission mode:
Clear 45 songs in game mode.

A Stupid Barber:
Beat the Funky Groove Nonstop course.

Burnin' The Floor (Momo Mix):
Beat the Naoki Neo-Standard Nonstop course.

Keep On Liftin':
Pass every Nonstop course

Naoki Premium:
Beat the Naoki Neo-Standard Nonstop course.

PARANOIA Survivor Max:
Get an AA or greater rank in all songs in the Paranoia Brothers course under Heavy mode.

Paranoia Survivor MAX:
Get an AA rank for every song in the Paranoia Bros. Max 2 Oni course.

Paranoia Survivor:
Beat the Paranoia Brothers Oni course.

The Legend Of MAX:
Play every song.

Tomorrow Perfume:
Get an AA rank.

Trip Machine survivor:
Get an A on Trip Machine Survivor under Heavy mode.

Try 2 Luv. U:
Get twenty A's.

Un Deux Trois:
Get fifty A's.

Additional Dancers option:
Beat every Nonstop course.

Angel's Oni course:
Beat ten Oni courses.

Brand New Songs Oni course:
Beat the Brand New Songs Nonstop course.

Brand New Songs Nonstop course:
Beat A Stupid Barber.

Darkness Oni course:
Beat any song on dark mode.

From GF & DM Oni course:
Get an A on Mikenko Rock in Heavy mode.

From IIDX Oni course:
Beat an Oni course.

Legend Road Oni course:
Pass True Demon Road Oni course.

Legendary Road Oni Course:
Play every Max song.

Rap 5 Oni course:
Get an A on Daikenkai challenge.

Rebellion of Oni (Oni course):
Beat light, standard, or heavy mode.

Remix Nonstop course:
Beat the standard nonstop course.

RevenG and TaQ Oni course:
Beat five Oni courses.

Reverse Oni course:
Beat a song in Reverse mode.

Slow Road of Oni (Oni course):
Get an A in bag heavy mode.

True Demon Road Oni course:
Beat 20 Oni courses.

Ultra 16 Oni course:
Beat the Legend Road Oni course.

Thanks to Revolution readers Jessica C., MCEscher, Jolene, Mexstacy, Jericho Bush, Psyko Aktive, and Narith Chit!