The The Secret Armory of General Knoxx Add-on for Borderlands has 9 trophies - 7 bronze and 2 silver.
Completed all missions in Secret Armory
Killed each of the loot midgets
Reached Level 61
Paid for a worthless tour of the world's largest bullet
Killed Crawmerax the Invincible
Destroyed a Lancer while in a Racer
Destroyed Lance Depot
Rescued Athena
Built the New Car: Monster