This Achievement unlocks at the end of the game if you get 100 or more points with one player.
Set up a game using a good team (like Florida) against a weak team (like Hartford) and crank the sliders up in your favour while reducing the sliders against the CPU. When you get possession of the ball, take all your shots using the same player.
Increase the length of the halves from the pre-game options if you are having difficulty getting 100 before the end of the game. If you make most of your shots from outside the three-point line you can also unlock the "15 Three Pointers" Achievement in the process.