You'll Never Take Me Alive!

Needs Legends of the Dead. Set Plague Frequency to Doomsday in the game rules at setup - it makes the game harder, so achievements stay enabled. When a plague hits your capital (move your capital into an infected barony if it's being shy, revoking a title if you must), start an activity that travels - a Pilgrimage is ideal for the distance - and arrive at a plague-free barony while the capital is still infected. Pops on arrival.