The The Secret Armory of General Knoxx Add-on for Borderlands has 10 achievements.
Destroyed a Lancer while in a Racer
Built the New Car: Monster
Rescued Athena
Destroyed the Lance Depot
Killed Crawmerax the Invincible
Killed each of the loot midgets
Reached Level 51
Reached Level 61
Completed all missions in Secret Armory
Paid for a worthless tour of the world's largest bullet