I did a challenge of the sort, I call it the Three Strikes Challenge. You have three lives and must play on Hard difficulty. You have those three lives to try to build and accomplish as much as possible, but the main goal being to build and expand your control over your land.
The rules are simple...
1 - Create a new world with cheats enabled (Explained in a bit)
2 - Use the seed "dickballs" (optional)
3 - Play on Hard
4 - If you defeat either the Dragon or the Wither you gain a life
5 - Hit 100 experience you gain a life (May only happen once)
6 - If you lose all your lives, switch to creative and do an overview of everything you've accomplished.
You can check out my series of it on my channel. I'd embed the videos but I can't.