Returned the Thieves Guild to its former glory

Complete "Hail Sithis!"

Successfully persuade, bribe, and intimidate

Complete "Bound Until Death"

Buy a plot of land

Make a smithed item, an enchanted item, and a potion

Complete "Revealing the Unseen"

Join the Dark Brotherhood

Reach Level 5

Absorb a dragon soul

Select a Standing Stone blessing

In Revelations, kill 10 enemies in one shot with each wonder weapon.