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In order to perform a Gamebreaker you will need to fill up the the Gamebreaker meter at the top of your screen. This is accomplished by doing tricks prior to making your shot. Tricks are done by pressing either X or Y. If you press Y when close to an opponent you will get a score multiplier. This can be done up to 4 times. Once you have your x4 multiplier just keep doing tricks until the shot clock is almost up then make a shot. If you lose possession at anytime either by having the ball stolen or missing your shot and not getting the rebound none of your points will count. Also the type of shot you make can give you even more points. A double dunk seems to give the most additional points.

It may take you a couple of possessions to get your Gamebreaker bar completely filled, but once you do you will notice the screen changes color a little bit and when you get the ball back a cone of light will appear at halfcourt. To activate your gamebreaker you will need to run into the cone of light and press Y. Now that you are in gamebreaker mode it is possible to get 6 points in a single shot. In order to do that you will need to fill the meter at the top of the screen again the same way you did before and then successfully perform a double dunk, which in gamebreaker mode is actually a triple dunk.

Your opponent can also steal your gamebreaker and use it against you, but luckily this rule works both ways.

For this achievement you need to perform 4 gamebreakers in the same game, so you can either fill your own bar 4 times or steal your opponents 4 times or any combination of the 2, as long you you successfully perform 4 of them. The achievment won't pop until after the game is over so don't stress if you just pulled off your 4th one and it didn't pop.

Easiest way is to play with two controllers. Press x/y plus RB many times before you make the point. Then switch to the other controller and "give" the ball back to your main team ...

If you steal the ball during the other team's GB play and you play tricks and score then it counts towards your 4 to get the achievement. I did this twice and only triggered my own 2 times and the achievement popped. :)

play a 30 point game, this should give you enough time to get enough points to get four gamebreakers
do lots of tricks and always dunk
never take shots, there worth nothing