A Kingdom Built on Slavery(Zewes)

Achievement Unlocked: A Kingdom Built on Slavery

Congratulations, now you have a slave holding kingdom! I expected better from you, John. What’s next, a sex harem? Wait, no, don’t you fucking dare! (Why do I even try?)

Reward: Slave Quarters and Harem Quarters unlocked on Kingdom Manager

Reference
Unlocked in Chapter 83 "A New Week A New John"