Completed the mission "Best Minion Ever"

Completed the mission "My First Gun"

Equipped a class mod for your character

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

Climb a chain link fence and rejoice.

Score a 10x multiplier in a Story level

Change your costume

Bring a veteran officer aboard.

Fell over the edge on Ziba Tower

Applied an elemental artifact

Killed 25 enemies with explosive weapons

Visit a store in the single-player campaign.