Some of mine are: reading 52 books, going for a walk at least once a week, getting a new piercing, and doing my budgeting every week instead of waiting multiple weeks, etc etc
What's everyone else's? Maybe comrades with similar goals can be accountability buddies 
Here's my list, in no particular order and I'd be thrilled if I even achieve just one:
Finally get a full-time job again and move out of my parents (and far away from my hometown) for good.
Get skilled in something that isn't vidya or media consumption. (It could be learning an instrument, actually figuring out some technology skills, art, just anything)
Stop seeing life like a piece of media and also stop mourning my childhood essentially. It's over. Time to make the most of adulthood.
Get some IRL friends and try to be a normal 20-something for once.
This is embarrassing to admit, but still important: I want to improve my hygiene: Have a skincare routine, actually learn how to take care of myself and take care of my hair and teeth before anything expensive catches up to me. Autism is impacting my quality of life, but I do at least have the free will to overcome my psychic blockages for lack of a better term.
I always recommend people to learn playing the guitar. It's relatively cheap, you just need to make one investment in the beginning. You can learn it by yourself using the resources from the internet or you can take a few lessons in the beginning. Learning to play it is relatively easy, you can make a lot of progress in just 2-3 months. Most of pop music is simple so you just need to learn some basic chords in order to play a lot of songs. Learning the guitar will make it easier to learn other instruments if you want. And of course you can then play in a band if you wish, which is the most fun part of it
I feel this, but remember - adulthood is what you make it. You will never have endless free time again, but you can bring some of your favorite hobbies from childhood into your adulthood. I feel like that fills the void for me. Good luck!