[ Register or Signin to view external links. ]

Max-out devotion to covenant
You need to reach Rank 3 with ANY Covenant for this to unlock. You need to get two to Rank 3 for other achievements anyway (as you need the requisite spells) so aim for those. The two are: Heirs of the Sun (once joined the need 30 Sunlight medals for max rank - gained by helped other players beat bosses or being helped in turn by members of this Covenant) and Pilgrims of the Dark (need to find the Darkdiver in three places and then complete the small dungeon in each of them and light the beacon, then defeat the final boss).