First off, CREATE a 1-match RANKED Battle match.
I say create because then obviously you have the advantage of picking a song you know well. Then, if you want the achievement really easily, pick Easy. Powerups such as Amp Overload will have less of an effect, and even if you do get Amp Overloaded, just look into your opponent's chart to play.
This may take a few tries due to Whammy powerups and Left Flip, but keep at it and you'll get it.