Quest: Dark Sanctum chain - Peace, Love and Homicide, Excavation, Awakening & Leverage
Worth: - Guild Seals
Location: Dark Sanctum (Mourningwood)
How to Complete: These quests will become available during the "Bowerstone Resistance" chapter. Complete the quests one by one when they are available and once you've completed the last one which finally opens the Dark Sanctum for Lesley the achievement will unlock. Here's a breakdown of each quest:

Quest: Peace, Love and Homicide
Worth: 15 Guild Seals
Location: Dark Sanctum (Mourningwood)
How to Complete: Lesley tell you he needs a man called Rhys dead. Simply head to Mourningwood and kill him. Theres no Good way to do this quest.

Quest: Excavation
Worth: 5 Guild Seals
Location: Dark Sanctum (Mourningwood)
How to Complete: Lesley needs 5,000 Gold to pay the workers. Pay him and this quest is complete.

Quest: Awakening
Worth: 5 Guild Seals
Location: Dark Sanctum (Mourningwood)
How to Complete: Simple battle quest. Lesley wants you to kill the monsters inside of the Sanctum. Head inside and defeat the waves of Hollow Men to complete the quest.

Quest: Leverage
Worth: 10 Guild Seals
Location: Dark Sanctum (Mourningwood)
How to Complete: Lesley wants you to head into the Sanctum to find a missing lever. Head inside and work your way around the Sanctum until you find the Ancient Lever. Make your way back out and hand it to Lesley. Achievement unlocked!

You now get to see a person sacrificed on the BBQ Pit. Doing the honors is completely optional, so dont feel you have to do it. If you do, you'll lose 50 Morality Points. From this point you can drag anyone to the Dark Sanctum for a roasting at anytime!