In 1.8? Nobody's done so that I know of. They just added, what, 900 provinces? It was achieveable before, they certainly keep trying to shut down any further achievement of it.
But yes, you absolutely could exploit this, but it would certainly be exploiting... I mean, nobody is gonna say I did that legit. If you just want the shiny "Achievement earned!" toast, then sure, do it, but it's not like you're really accomplishing it. I mean, 40 years in I have 100+ provinces with 0 autonomy, every German & Italian nation is mine (less Papal State, Venice, Urbino), and 4 global powers are in a PU under me. There's literally no challenge beyond advancing the years and crushing everything.