This achievement isn't nearly as bad as passing Wayne Gretzky's point total from last year. You will need to earn your offline legend card and then use the retire feature. This requires you to play 250 games and meet several requirements. The best way to do this is with an Offensive Defenseman because you won't need to worry about getting assists.
Once you get to an A- overall. Simply start up a game, score a goal and then quit out. You will keep an A+ overall throughout your career and by the time you reach the 250 games, the other requirements will be fulfilled. From the Be A Pro menu, go to "My Pro" and select the "Retire" option after you have unlocked your offline Legend Card.
Games Played: 250
Overall Grade: A-