Covenant: Way of White Achievement
Covenant: Way of White15
Discover Way of White covenant.
As soon as you reach Lordran, go into the building next to the one with the puddle of water and talk to the man named Petrus of Thorolund. After exhausting his dialogue, he’ll offer to teach/sell miracles and to join the Way of White.
NOTE: You don’t need to join the covenant, you just need to have the option to join for the achievement.