Make a possession receiver and start him on the Bears. This will make you start as a #2 receiver and have an 82 overall. I made my receiver 6'8 but you can prob make him 7'0 to make him truly unstoppable.

NOTE- Turn of fire coach option, if you coach is fired, your stats drop dramatically.

Each season play 4-5 games and run up the stats as high as possible. Lead the league each year receiving yards, tds, and catches. You may sim to the end but make sure you save around week 14 and see if you get the end of season rewards that you want to build your legacy.

You should get
OROY - Rookie of the year (first year only)
Offensive player of the year
MVP of the league
many other milestones

If you don't get the milestones above, reload your save and play more games to boost stats.

After you get the following rewards, sim your way game to game and win the superbowl, saving after each playoff game and reloading if you don't win.

Note- I play on all-pro and spent my first 100k xp in the developmental trait. I plan on using this player to get my 99 hopefully

This is a long grind as I am nearly done with my 4th year and have won all superbowls, and 2/3 mvp. I am currently at about 7k legacy. To pass Jerry Rice it takes 20k legacy.

I hope my tips help you , please feel free to leave feedback if you want to help with the solution

Note - Got this achievement 8 seasons in, winning the superbowl and mvp 7 seasons, breaking all records minus the reception record ( was 300 away).