A better way of getting this achievement is on Champoinship mode for 5 minutes on the very first board. Get the power pellet, eat the 2 ghosts and eat all the dots that are there but don't get the 2 cherries. you will be the only person on the board until a ghost respawns but it won't be for about a few mintues when he does. There will be a total of 3 ghosts that will respawn within the 5 minutes. Just circle around the board for the whole 5 minutes without getting the cherries and the achievement's yours. Enjoy..