ICanSnake Whoa! I wouldn't have the time nor the patience to do a third of the things you mentioned!
I feel the Pokédex is ridiculously hard to complete. I've only ever completed the Alolan Pokédex, but at least the others only required you to catch each Pokémon once. This one requires multiple other tasks. I don't even know if it is possible to catch one of each Pokémon without an online subscription - which I am not planning to get.
And shiny hunting would require a lot more time than I will ever be able to dedicate to a game. I did some shiny hunting in friend safaris in Pokémon X, and some chain fishing in Sun, but that was it.
As for finishing the story within a week, I'd have to quit one of my two jobs in order to do it. I've already beaten the Coronet boss, but getting there took me over a month. And I spent the last two weeks doing quests. That said, it's not like I get to play everyday, or spend four hours of a single day playing, so I understand that my pace is slow and have accepted it.
So... congratulations on all those otherworldly achievements!