The The Reaper's Due Add-on for Crusader Kings II has 12 achievements.
Recover from the Black Death.
Die from the Black Death.
Contract three symptoms.
From Seclusion, kick someone out who did not have the plague.
Go into Seclusion.
Build a Hospital.
Have elephants trample the Pope/Caliph.
From Seclusion, kick someone out who had the plague.
Survive the End Times.
Kill a character with the Immortal trait.
Become immortal.
Become One-Eyed, One-Legged and One-Handed.