I made a roster "49ERSLEGACY" you can download. Do so, and adhere to the following steps for all 10 Legacy achievements in 10 minutes.
- From the menu, go to “Download Community Files”. Use cn_RB / cn_LB to move over to the “Rosters” section.
- Download "49ERSLEGACY" roster (created by NoHeroes94, description is "Use for all legacy achievements"
- Revert to the menu, go to settings, share & manage files, and load/delete. Load the “49ERSLEGACY” roster
- Head over to franchise mode. Select “Cloud Franchise” to speed up simulations.
- When it asks you to use active NFL roster or Custom Roster, you MUST select Custom Roster. This is why we loaded the roster 2 steps ago. After this, select the San Francisco 49ers (or the respective team if you had to download a different roster).
- Create a custom coach. Make him a Motivator. Name, ethnicity, and details make no difference and are arbitrary.
- Go to league settings and change to the following: Difficulty – ALL MADDEN, Salary Cap – OFF, Injuries – OFF, Pre-Existing Injuries – OFF, User Team Help – SIMPLE.
- Start your franchise, and simulate the regular season for 10 years.
- That’s it. Just put your controller down, make a sandwich, or watch whilst the games simulate and achievements (very quickly) pop.
