To unlock the following Imperial City DLC Trophies, complete the following tasks.

Trophy	How to unlcok
Big Score (Bronze)	Gain 900 Tel Var Stones from a single kill.
Imperial Arena Champion (Bronze)	Complete the Imperial City Arena by slaying the Ringmaster and her monstrous servants.
Imperial Lightbringer (Gold)	Complete the Barathrum Centrata event deep beneath the Imperial City.
Patrolling Horrors (Silver)	Kill all the Patrolling Horrors in the Imperial City.
Protector of the Faith (Bronze)	Complete the Imperial City Temple event by defeating the Daedric Titan, Uzuruz.
The Sublime Protector (Silver)	Bring an end to Molag Bal's secret plot in the Imperial City.