I used Yak (Page 5 bottom row 3 from the left) against the chimp (page 3: second from the right nesmith) However Fanboy (page 1 bottom right hand corner) has the lowest star batting average.
I tried using the humans at first and it wasn't working. Aim your left stick towards the target and press B when the ball is near you. You will hit the target, and want to keep your streak alive by not swinging and missing. If you hit 3 targets in a row, you get a chance to hit the bonus 30k point scoreboard. Do this 3 times and the achievement is yours. Easy.