Kill an enemy with the Siren's action skill
Kill 15 enemies with the Berserker's action skill
Kill 15 enemies with the Soldier's action skill
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Discover Crimson Lance Enclave
Complete all missions in the Rust Commons
Rescue enough Claptraps to earn 42 inventory slots
Discover Trash Coast
Discover Krom's Canyon
Discover The Scrapyard
Complete 5 missions in the Rust Commons
Complete 15 missions in co-op
Complete all missions in the Arid Badlands
Kill 25 enemies with corrosive weapons
Earn level 50
Earn level 40
Master the technology of Pandora
Kill 25 enemies with explosive weapons
Sell 50 guns to a shop
Equip a class mod for your character
Defeat the Rakk Hive, the Vault Boss, Sledge, Krom, or Flynt in a co-op game
Discover Headstone Mine
Kill 25 enemies with shock weapons
Earn level 30
Rescue a groupmate from death in a co-op game
Earn $1,000,000
Earn level 20
Reach proficiency level 10 with any weapon type
Discover Eridian Promontory
Win an arena match
Win a duel against another player
Win a duel without taking damage
Discover Sledge's Safe House
Kill 25 enemies by ramming them with any vehicle
Earn level 10
Kill 5 Rakk in under 10 seconds
Kill 25 enemies with incendiary weapons
Kill 15 enemies with the Hunter's action skill
Discover Skag Gully
Earn level 5
Play in a co-op game with either an employee of Gearbox or someone who has this achievement
Complete 5 missions in the Arid Badlands
Kill an enemy by stomping on its head
Race around the Ludicrous Speedway in under 31 seconds
Apply an elemental artifact
Complete the "House of the Ned" mission
Complete the "Jakobs Fodder" mission
Kill Ned
Actually kill Ned
Complete the "Braaaaaaaaaaaaains!" mission
Complete the Prove Yourself mission
Reach the end of the larger challenge in the Hell-Burbia coliseum
Reach the end of the larger challenge in The Angelic Ruins coliseum
Reach the end of the larger challenge in The Gully coliseum
Reach the end of each of the 3 larger challenges with one character
Build the New Car: Monster
Rescue Athena
Destroy the Lance Depot
Kill Crawmerax the Invincible
Kill each of the loot midgets
Destroy a Lancer while in a Racer
Reach Level 51
Reach Level 61
Complete all missions in Secret Armory
Pay for a worthless tour of the world's largest bullet