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