Since the other solutions where not that informative I have decided to make a better one.
Before starting, make sure you have downloaded the AFC legacy Pack.
EDIT: The AFC legacy Pack is no longer available on the marketplace
From the main menu go to Career Modes ----> franchise Mode---> new franchise. Pick the pats (patriots )as your team. Once you advance to the schedule you want to SIM the PRESEASON. After you simmed the preseason you are now in the regular season portion. The 1st game (week 1) will be the AFC legacy game. Feel free to set the difficulty to rookie and Qt. length to 1 min.. You can tell this is the game your looking for because both teams will have the old school logos and jerseys. Also the In game interface will look old school as well. In addition you will see AFC 50th Anniversary Legacy Game under the score banner at the bottom If you are on defense 1st use the method of going off-sides to sack the QB. Once you have possession of the ball get a TD. Once you that that TD once you get the ball back pick QB kneel to run the clock down.
Note. You may NOT get an achievement unlocked notice at the end of the game. I did NOT and I thought I didn't get the achievement. I looked at my achievements to see which ones I had left and there it was, unlocked. So before you go all crazy thinking you didnt get it, check your achievements.