How to Obtain the Paragon of Virtue Achievement
Pick the Earl of Dublin in 1066, because of his fixed starting traits. Select Theology focus, and do the most expensive Pilgrimage as soon as possible.
Work your way toward the Prophet perk in the Theologian tree, and once you have that and enough Piety, reform to Carnal Exaltation, Monasticism, and Syncretic Folk Traditions.
Should take about 15 years and its a guaranteed achievement.