Shut Up, Nerge
Ultra rare0.9%ObjectiveOptionalSingle-player
Host an Excellent Nerge
Needs Khans of the Steppe. Host a Nerge (the nomadic great hunt) and land the maximum "Excellent" result. Temüjin in 1178 has the ideal stats - the wiki reckons an Excellent lands within a few attempts with him - so host, take the success-maximising options throughout, and re-run it if the score falls short. You'll be Nerge-ing constantly for This Chinggis Everything anyway, so this tends to pop en route.