Legacy Achievements Not Popping

 Hello, I am a ps4 player who's trying to get the platinum trophy. I have 10 generations of sims here, and cheats arnt enabled. The "Legacy Player" trophy will not pop for me. 

Could this be an issue with science babies? I rarely let my sims be pregnant, usually using the science baby option. Because of this, is that what's causing the trophy not to pop?

Any feedback will be appreciated, thank you.