This one has medium difficulty. First the easy path to this is to achieve it through one of your created defensive HoF Players(LT,RW,or PrimeTime).choose the high draft choice,and find a team that badly needs your skills.Next go to the league sliders and only turn off the Offsides slider to 0 and make sure it in on rookie *note* If you want to get this achievement in 3 seasons,DON"T SIM!! Get behind the opposing QB and sack him when he hikes the ball. Do this for every game. I sometimes got 15-20 sacks a game,and I won 3 superbowls and had 3 perfect seasons. After this go to the Retirement option.This took me 2 weeks. Good luck!!!