Completed all missions in the Arid Badlands

Killed 25 enemies with corrosive weapons

Reached proficiency level 10 with any weapon type

Completed 5 missions in the Rust Commons

Knife an enemy without him ever knowing you were there in Single Player or Special Ops.

Kill at least 3 enemies with a single shot from a grenade launcher in Single Player or Special Ops.

Equipped a class mod for your character

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

Killed 5 Rakk in under 10 seconds

Killed an enemy with the Siren's action skill

Won a duel against another player

Rescued a groupmate from death in a co-op game

Killed 25 enemies by ramming them with any vehicle