Completed the "House of the Ned" mission

Killed an enemy with the Siren's action skill

Played in a co-op game with either an employee of Gearbox or someone who had this trophy

Rescued enough Claptraps to earn 42 inventory slots

Discovered Eridian Promontory

Killed Flynt

Killed 25 enemies with corrosive weapons

Killed the Rakk Hive

Reached proficiency level 10 with any weapon type

Discovered Krom's Canyon

Discovered The Scrapyard

Earned level 20

Equipped a class mod for your character