There are ten new Achievements worth a total of 250G:
Making a Monster - 10 - Build the New Car: Monster
Athena, Out - 25 - Rescue Athena
Depot Demolition - 25 - Destroy the Lance Depot
Vincible 50 - Kill Crawmerax the Invincible
Sneaky Little Buggers - 25 - Kill each of the loot midgets
Speed Kills - 25 - Destroy a Lancer while in a Racer
Ding! Overleveled - 15 - Reach Level 51
Ding! Overleveled to 11 - 40 - Reach Level 61
Completionist - 25 - Complete all missions in Secret Armory
Secret Achievement - 10