The Dark Brotherhood The Dark Brotherhood:

Achievements Reward Detail tab
Fast EnlistmentFast Enlistment 40 Complete “The Dark Brotherhood” in less than 15 hours
Join the ClubJoin the Club 100 Exotic Wood x 150 Complete “The Dark Brotherhood” in less than 5 hours
Brotherhood EffortBrotherhood Effort 80 Complete “The Dark Brotherhood” while losing fewer than 600 troops
Cold DarknessCold Darkness 80 Complete “The Dark Brotherhood” without using any crossbowmen or cannoneers

Achievements x 300 + Exotic Wood x 150