firstly start a franchise don't matter what team
- sim the first week only then accept when asked if cpu can make cuts.
- sim the second week and repeat
-sim the third week and repeat
this time (week 4) sim just the game then press (Y) and choose (Cut Days) Press (A) to pick 1 player and accept the achievement will then pop
it may seem like a lot more than just simming the 4 weeks together but i tried that and the cut days disappeared because the cpu will automatically cut the players for up to regular season.