Not going to lie, I went into this campaign with the intention of just clicking on any silly thing and seeing what happens. I started by conquering the Smyrna coast, flipped Greek and then Turkish using the Grandmaster Election to get around the culture requirements, then I took over the "Rise of the Turks" situation and seized all of Greece and Anatolia. Then before the situation ended, I used it and the Catholic antagonism reduction to seize the Holy Land from Egypt and formed Jerusalem.
After beating Egypt, I started to expand fast into the Crescent and the Caucasus. I received invitations to join the Ilkhanate AND the Middle Kingdom, which I thought would be hilarious, so I accepted. Big mistake as that prevents you from becoming an empire unless you lead the IO and have a Borjigin on the throne, all of whom were dead. I was going to dismantle the HRE, but due to this I decided to take-over Persia instead.
After lots of wars against Georgia and the Timurids, I destroyed the Ilkhanate, left the Middle Kingdom, flipped Cathar and lost the order reform, and bumped up to empire rank. To finish off a quite cursed campaign, I decided to stretch my borders from Italy to China and seize Vienna to show the Muslim Turks how it's done. I swapped to Sunni and back again to form Rūm, but the conversion back to Cathar unfortunately removed some Turkish reforms which was a bummer. I finished with my capital in Smyrna and governors in Austria, the Delta, Syria, Baghdad, Delhi, and Gujarat. I used vassals to split my capital from the Delta and get a naval governor in Alexandria, and I used the Ranns to get another naval governor in India to boost control over there.
All in all, it was a fun, little test-run of the systems creating a truly cursed timeline. All hegemonies except Diplomatic, 139m pops nearly reaching China's total, almost 1m regulars with 4m levies, and a 170k tax base. The main thing I bungled looks to be prosperity, I blame subpar choices of reforms and values which I was loosey-goosey with after pivoting from Decentralization to Centralization late-game. But a good lesson going into the next run, which I've been dared to finish as the Ásatrú Shogunate of Mexico (any ideas to create this monstrosity are welcome!).
Edit: Reuploaded after fumbling the screenshots.