NBA 2K10

Quite simple actually.Find a free throw shooter you are comfortable with, do this by going to game modes, practice then free throws. Go through the teams and find a shooter or a whole team that you like or if you already know who you like thats fine too. I chose Paul Pierce who is preety good but Steve Nash and Jason Kidd are also good.
Then start a quick game any difficulty you choose how long the quaters are just make sure they aren't too short. Make sure you have 2 controllers and you pick the the team with the player you like and then with the 2nd controller pick another team to go against you.
Once the game has started as you go up the court give the ball to your player of choice and then pick up the 2nd controller and intentionally foul that player continually do this until you are sent to the foul line. Then it is simple take a minimum of 10 free throws and make 85% of them (find this out in game stats). Once you have taken 10 and made at least 9 of them just play the game out and if you do get fouled and miss just even it out like you did at the start of the match to keep yourself above 85% and once the game is over you will get the achievement.
Hope this helps.

This is easy!! First, go to gameplay option and edit the difficulty of free throws to 0. It is not in the game sliders!! Then, start a quick game with 2 controllers. U choose any team that has a good free thrower, like Kobe Bryant!!! Controller 2 can be any team. When the game starts, hav controller 2 keep fouling ur player(press select button). U only need 10+ so just shoot that much free throws. I recommend you dont miss 2+ free throws if u go for 10!!! U can do this in 4mins!!!! Achievement pops at the end of the game!!!