There are 10 new Trophies in this DLC.

BRONZE

By My Hand Alone
You made it to Wave 13 in Back Alley Brawl killing all combatants personally

Assassin Vs. Machine
You completed Train Runner before the train arrives at the station

Rare Collector
You found all of the collectable figurines in the Burglar on Expert

Long Way Down
You performed a drop assassination of at least 150 meters in the Kill Cascade challenge

Headhunter
You completed Assassin's Run with 100% accuracy using only head shots

Daredevil
In Bonfires, you performed all the special combination jumps in 1 round

Natural Talent
You finished Mystery Foe without using any active supernatural powers

Time Management
You finished Chain Kill or Bend Time Massacre without failing any wave, including bonuses

SILVER

Mrs. Pilsen's Remorse
You found Emily's doll hidden in each of the 10 challenges

Void Star
You completed all Normal and Expert challenges with a 3-Stars rating

http://www.ps3trophies.com/forums/playstation-trophy-news/26804-dishonored-dlc-dunwall-city-trials-trophy-list.html