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Difficulty: Very Hard
Does not require two distinct grandparents or great-grandparents. Requires having no more than 12 unique characters among the player's parents through great-great-great-grandparents (the maximum possible is 62; 62 − 50 = 12). If there is no recorded parent, as for lowborn, it's counted as a whole tree of unrelated ancestors.
Start in Iceland with the restricted diplomatic range rule, where you're rather isolated and can be left alone. Use the Ruler Designer to create a character of the Messalianism faith with the Pure-blooded trait, then inbreed siblings for three generations. The greatest threat to this achievement is cuckoldry. Playing a female ruler (easy as Messalianism is gender-equal) together with the predominant Homosexuality or Asexuality rules can alleviate this.

Alternatively, play as a Zoroastrian ruler somewhere in India. Since it is an Eastern Religion, you won't have to worry about Holy Wars.

**This achievement is bugged in the current patch (as of April 2025). It will never trigger no matter what you do. Use the Steam Beta feature to roll your version back to 1.13.2 and it should trigger if you've met the requirements.

Information sourced from the wiki.