NHL 2K10

Easy way is to go into the nhl rules and turn custom penalty length on set the penalty length down to 6 seconds. Then turn up all the penalties to 100. With 1 minute periods you can get around 30 penalty minutes a game.

Turn off custom penalty length. Set the game to 1 minute periods (you're going to want to do this anyways as 500 games played for that acheivement is a lot).

Now, turn penalties in the sliders to the max, and work towards the "500 hits" achievement first, as you'll get a good number of penalties while working towards that achievement.

Once that one's done we then just want to grind penalties, so instead of doing hits, do the following:

When the game starts, win the faceoff and skate the puck back to your goalie. Once the goalie has the puck take him to the trapezoid areas to the left and right of the net behind the goal line. He'll then get a "delay of game" penalty. Rinse & repeat and you'll have 500 in no time (and a lot of games under your belt as well).

Turn Penalties off and max Fighting chance.

You'll have to play 500 games anyway, so taking 15-20mins of penalties per game (2min periods) - it'll pop eventually, and you can chose to ignore the fight button if you wish.