Just a current google sheet of the 100% list of Achievements, mostly for personal use as I want to try it on all difficulties or atleast some.

https://docs.google.com/spreadsheets/d/1vQ9e_hVHGPu_HHPIyg6AuIii2-aOZrsMYWfoZYDF_hU/edit?usp=sharing

Basically:

20 Seasons

10 RBS (3 in a row, one without Star Players)

Score 500 TDS

2/3/4/5 hundred yd Pass Games

3/5 TD Games

25/50/60 yd Field Goals, with a Doink, 2 pt conversion

50/100/150 yd Rush Games

5 Star FA, 5 star OC, 5 star DC

50 TD Season (QB)

100 Career Wins

Trade a player In and Out

Win NFC and AFC

Max Stadium, Training, Rehab, Morale, Fans, Offense, and Defense

10/25/50 yd Pass

5/10/15 yd Run

New Team

Shutout

50 pt Game

25/50/75/TD Returns

May be subject to change, may be missing 1, other then that, it does the job.