For the easiest possible way to do this achievement, you'll want to find yourself a song that is purely made up of talky-parts where you're supposed to just make noise to the rhythm of the words.
The best one that springs to mind is "Firestarter" by the Prodigy.
All you do for the entire duration of the song is tap your palm on the microphone, this makes a constant noise and will register all of the notes in the chart. If you're unsure what I mean, it's not too dissimilar to the percussion sections during the Rock Band vocals - where you're supposed to tap the microphone onto your palm like a tambourine.
I, personally, did this one the mix of "Get Low" and "In Da Club" - only at the start is their an actual vocalized part, and if you manage to pull it off you're home and hosed.
This method is also useful in trying to nab the 200 note streak achievement, Microphonical Magic!