Completed 5 missions in the Rust Commons

Reached proficiency level 10 with any weapon type

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

Won a duel without taking damage

Completed all missions in the Arid Badlands

Applied an elemental artifact

Earned level 20

Killed 5 Rakk in under 10 seconds

Sold 50 guns to a shop

Killed 25 enemies with explosive weapons

Completed 15 missions in co-op

Killed an enemy with the Siren's action skill

Discovered Skag Gully