The Left Behind Add-on for The Last of Us (PS3) has 10 trophies - 9 bronze and 1 silver.
Finish Left Behind on Easy
Finish Left Behind on Normal
Finish Left Behind on Hard
Finish Left Behind on Survivor
All optional conversations found in Left Behind
All Left Behind collectibles found
Played Jak X Combat Racing
Defeat Black Fang without getting hit
Win the water gun fight
Win the brick throwing contest