You will probably get this from playing through the game, but if not a good level to get this on in 3-9, with the bubble-type floor. Bananas are generally out of the way and you may miss them all by accident anyway,
Note that if you collect any bananas and then fall off the stage, those bananas will still count so you won't be able to get this trophy. However, if you continue after losing all your lives, the bananas are back.