I'm glad to see I wasn't the only one to get all 18! This game became ridiculously easy - I did face some GWI and GWB from Assyria and USA, but everybody else still had Rifles and no air, and Denmark didn't even have Rifles. Meanwhile I'm upgrading all the way up to eventually Modern Armor and Jet Fighters, LOL.
I only made it to 69% and 77% influential over USA and Bill-O, in part because WC passed trade ban with Bill-O. I also didn't worry about theming late, and considered selling my Hotels and Airports to slow Tourism down.
I was 7 turns from Internet and about to start IG. 4k Faith in the bank.
Full Trad, Full Piety, Full Aesthetics, 4 in Patronage, Rat to Secularism, 2 in Commerce, 11 in Freedom - I just started grabbing tenets late, didn't really care.
T282-Madrid, 289-Assur, 294-Washington, 296-Jakarta, 299-Thebes, 304-Amsterdam and Copenhagen. So 18 turns to take all 7 capitals.
I took Utrecht the last turn as well, just because, so I dipped into negative happy for the only time. Since I had planned on CV, I didn't have much for roads heading towards Bill-O. Pretty awkward travel route NW to SW to NE... lots of traffic jams. I had warred plenty earlier, mainly liberating cities.