There's no beating war and conquest in Civilization.
- Secure Uranium. (So settle strategically, rather than wide).
- Slot in Total War and pillage your way to Robotics for GDRs. (Also take the free GDR from Automation Warfare).
- Supply Convoys will give GDR extra movement.
- First GDR: Washington -> London.
- Buy a second GDR: Canberra -> Bogota -> Gyeongju.
- Moksha (gov) with Healing Hands promotion was useful to heal up armies quickly.
- Build a navy for home continent and an army of artillery and Mounties for Australia.
- (Don't forget) Canada: cannot surprise attack, so plan ahead and denounce leaders so by the time your units move they can attack.
I think getting the Deity Alexander scenario achievement might have helped considerably

B'cos it's all about strategic military planning.
EDIT: So you do need to eliminate all civs rather than Domination.
View attachment 683530
I ought to have won here (for Domination) but shoulda known better (as a modder) that that victory wouldn't trigger.
I was 3 cities away from wiping the map. So close. But I'm done.
This is for anyone else wanting to attempt the 0.66%.