You do not have to play the full 20 minute game to get this achievement.
DNF matches count towards the 75 games played, Win or lose.
You need to only play 2minutes and 30 seconds of the game before anyone decide to quit the game, score is irrelevent.
The easiest way to pass the 150seconds is to make sure there are no whistles to stop the game. After the tipoff. have the team with the ball carry the ball over half court and run out most of the 30 second shot clock. Which ever team gets the rebound repeats the process of running down the shot clock. This passing time also applies to the full ranked matches for the 5 wins (I Can Win With Anyone!/Spoiler) just make sure the person who needs to get the achievement wins.