While I agree that you could jump in with Yakuza: LAD, I think it might be worth playing the earlier games for Infinite Wealth because Kiryu is one of the main characters. There will probably be a lot of references to the previous games because of Kiryu’s bucket list.

Yeah, should be in the global achievements assuming you know which one is for finishing the game. So far, it looks like this is at 16.8%.

My earliest memory is playing either Chase HQ or Kinnikuman Muscle Tag on the Famicom.