To unlock the following Thieves Guild DLC Trophies, complete the following tasks.

Trophy	How to unlock
A Cutpurse Above (Silver)	Steal every treasure from Kari's Hit List and place them all within the Thieves Den.
Broken Wheel (Silver)	Complete quest "Prison Break" in Hew's Bane.
Hero of Hew's Bane (Gold)	Complete quests, defeat bosses, and explore delves to become the Hero of Hew's Bane.
Honor Among Thieves (Bronze)	Assist each member of the Thieves Guild in resolving personal matters.
Master of Shadows (Bronze)	Complete 1 heist for the Thieves Guild without being detected.
Welcome to the Thieves Guild (Bronze)	Join the Thieves Guild by completing quest "Partners in Crime" in Hew's Bane.