Demon Soul Keeper

When you get the Baptism in Fire achievement by getting the first corrupt, gaining the soul, and gaining a new demon as a minion, you get +1 on this achievement for as long as you keep that soul. If you move or trade the soul, you lose the point for that soul.

Level 1
10
Level 2
25
Level 3
50
Level 4
100
Level 5
250