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Fun achievement to get, also easy and fast.
a) Go to Play Now and select any two teams. (You should be a team like the Heat, Cavilers or Lakers)
b) Now set the Quarters to 12 because once you do ten dunks you will unlock this. Also set the difficulty to rookie.
c) Now with D-Wade, Kobe or LeBron, just drive in with some dribble moves, and since it's on rookie, it is basically always an easy dunk with these 3.
d) It doesn't just have to be with one player, can be with whole team also.
e) If you can't unlock it like this, just go to the sliders, and make dunking to the max!