There is an achievement named Truly Divine Ruler.
The description is : Get a 5/5/5 Ruler.
Considering you can't choose directly your next ruler, is there a way to get this achievement excluding luck ?
I think the easiest way is as a republic, just keep reelecting the same ruler until his stats are 5/5/5. You can shop around republics at the start and see if one of the rulers is already close so you might need only a single election (Venice is one such choice as of writing this).