Crusader Kings II achievements

As an Anglo-Saxon or Saxon ruler, be king of both Saxony and England

Sacrifice another religion's head as a Norse or Aztec pagan

Fund an immoral bishop and get him elected Pope

Rule the Empire of Britannia as a Hindu, Buddhist or Jain character

Convert Mecca to Hinduism, Buddhism or Jainism

As a Zoroastrian, become the prophesied Saoshyant

Have 100 kills in your Kill List.

As a Jew, create the Kingdom of Israel

Gain the Legendary Wisdom modifier

As the Anti-Christ/spawn of Satan, become Grandmaster of the Satanists.

Have 6 close family members as friends

Kill a character with the Immortal trait.