College Hoops 2K6 is extremely easy on regular, and to make it better, you can change game sliders to your advantage and actually edit players themselves. It should only take one game (30-40 minutes) to get the full 1000. I always play with North Carolina as they're one of the best. 

Go to roster management and change all your guys stats to 99, and make them all 7'6" tall. Next, choose Cal Poly (one of the worst teams) and edit all their stats down EXCEPT shooting tendencies. This will make them shoot a ton even though they're going to miss. Also, change their height to 4'6". Now, after adjusting the sliders, go into a play now game with you on the good team. 

ACHIEVEMENT GUIDE

Make 15 3-Ptrs in One Game - 250 points

This was achieved by making 15 3-pointers in a single game

The first achievement you should go for is Make 15 3-Pointers in One Game. Memorize a guys number and keep passing him the ball. With the sliders up, he'll never miss. Keep making it then stealing the ball until you reach 45 points. That'll net you 500G, as it also earns 40 points with one player. 

Score 40 Points With Any Player - 250 points

This was achieved by scoring 40 points in a game with any player

See "Make 15 3-Ptrs in One Game" above.

Got 45 Rebounds With Any Team - 200 points

This was achieved by getting 45 total rebounds in a game with any team

For this, you may want to turn your shooting stats down so that you'll miss more and can get more rebounds. If that isn't working, turn all fouls/penalties off. That will allow you to stand at the back of the wrong end of the court without getting out of bounds called. Stand behind their goal (in the out of bounds) and shoot. The ball will bounce off the back of their backboard and you can grab it, getting your rebounds. Keep on doing it until you reach 45. That brings you up to 700G. 

Got 20 Steals With Any Team - 150 points

This was achieved by getting 20 steals in a game with any team

Now When you get the ball, just launch a shot and let them get the rebound. When they have the ball, steal it. Rinse and repeat to 20 steals and 850G.

Get Six Blocks With Any Player - 150 points

This was achieved by getting 6 blocks in a game with any player

This is easily the hardest achievement in the game, but it's still not too hard, considering you're three feet taller than all of them. Generally, when they take the ball down court, they'll pass it once and then shoot it. Just press (Y) and your guy will jump and should block it. 

Don't really worry about who you're using to get the blocks until the second half. When the second half starts, look at your stats and see who has the most blocks. Start using him only, and just jumping every time you think they're shooting. You should be able to get the 6 by the end of the game, netting you the full 1000G.

NOTICE: ACHIEVEMENTS DO NOT POP UNTIL AFTER THE GAME ENDS