Completed 5 missions in the Rust Commons

Raced around the Ludicrous Speedway in record time

Completed all missions in the Arid Badlands

Killed 25 enemies with shock weapons

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

Discovered Headstone Mine

Discovered Sledge's Safe House

Killed 25 enemies with explosive weapons

Sold 50 guns to a shop

Killed 25 enemies with incendiary weapons

Killed 25 enemies by ramming them with any vehicle

Killed an enemy plumber-style

Completed 15 missions in co-op