Killed the Interplanetary Ninja Assassin Claptrap

Killed Dr. Ned-trap

Destroyed Lance Depot

Complete mission "Hostile Takeover".

Complete mission "Taking Flight".

Kill an enemy with an exploding barrel.

Reach level 2.

Rescued enough Claptraps to earn 42 inventory slots

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

Killed 15 enemies with the Berserker's action skill

Earned level 40

Emerged victorious from an arena match

Won a duel against another player