Completed 5 missions in the Rust Commons

Earned level 20

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

Discovered Headstone Mine

Applied an elemental artifact

Killed 25 enemies with explosive weapons

Earned level 10

Killed an enemy with the Siren's action skill

Killed 5 Rakk in under 10 seconds

Earned level 5

Rescued a groupmate from death in a co-op game

Defeat 70 enemies with the M4

Defeat 100 enemies with headshots