Oh. To support an older suggestion.
BlindFolded - Gain SS Rank on 50 songs with the Flashlight Mod
Now You See Me... - Gain SS Rank on 50 songs with the Hidden Mod
Gotta Go Fast! - Gain SS Rank on 50 Songs with the DoubleTime Mod
Hard-Core - Gain SS Rank on 10 Songs with the Nightcore Mod
Pressure - Gain SS Rank on 50 Songs with the SuddenDeath Mod
Rockin' Out - Gain SS Rank on 50 Songs with the HardRock Mod
Ultimate Challenge- Complete 50 Songs with the Perfect Mod
Life's Not about Spinning - Complete a Song with the SpunOut Mod
I approve of the others, But I'm kind of meh on "Ultimate Challenge , Hard-Core and Life's not about spinning"