PowerGig Rise of the SixString

I got this achievement while going for Power Trio. You'll need two people for this method. Play the song "Bombtrack" by Rage Against the Machine. I was playing legend drums, had the vacuum cleaner singing legend vocals, and my mother was playing guitar on the easiest difficulty. Be sure that the mojo is set to activate automatically for all of the instruments (they have their own unique settings). I had guitar manually activate its mojo as soon as it was ready, and the drums and vocals activated mojo automatically when they were full and this achievement popped near the end of the song.