Reached proficiency level 10 with any weapon type

Equipped a class mod for your character

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

Discovered Headstone Mine

Killed 25 enemies with shock weapons

Defeat five enemies in a row with headshots

Defeat 20 enemies with headshots

Defeat 20 enemies with hand-to-hand combat

Rescued a groupmate from death in a co-op game

Applied an elemental artifact

Discovered Sledge's Safe House

Killed 25 enemies by ramming them with any vehicle

Killed 15 enemies with the Soldier's action skill