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

Defeated the Rakk Hive, the Vault Boss, Sledge, Krom, or Flynt in a co-op game

Completed 15 missions in co-op

Rescued enough Claptraps to earn 42 inventory slots

Emerged victorious from an arena match

Won a duel against another player

Killed the Vault Boss

Discovered Crimson Lance Enclave

Earned level 30

Killed the Rakk Hive

Killed Krom

Discovered Krom's Canyon