No missable achievements (plus 80 unknown)
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Completed 5 missions in the Arid Badlands
Earned level 5
Discovered Skag Gully
Earned level 10
Killed 25 enemies with incendiary weapons
Discovered Sledge's Safe House
Killed 25 enemies with explosive weapons
Killed 25 enemies by ramming them with any vehicle
Killed 5 Rakk in under 10 seconds
Equipped a class mod for your character
Applied an elemental artifact
Discovered Headstone Mine
Sold 50 guns to a shop
Earned level 20
Completed 5 missions in the Rust Commons
Killed 25 enemies with shock weapons
Reached proficiency level 10 with any weapon type
Rescued a groupmate from death in a co-op game
Discovered The Scrapyard
Completed 15 missions in co-op
Earned level 30
Discovered Krom's Canyon
Killed 25 enemies with corrosive weapons
Earned $1,000,000
Completed all missions in the Arid Badlands
Discovered Trash Coast
Discovered Crimson Lance Enclave
Discovered Eridian Promontory
Killed 15 enemies with the Soldier's action skill
Killed an enemy with the Siren's action skill
Gamed with fame
Killed 15 enemies with the Hunter's action skill
Won a duel against another player
Earned level 40
Completed the "House of the Ned" mission
Built the New Car: Monster
Completed all missions in the Rust Commons
Completed the "Jakobs Fodder" mission
Won a duel without taking damage
Rescued Athena
Killed 15 enemies with the Berserker's action skill
Destroyed the Lance Depot
Rescued enough Claptraps to earn 42 inventory slots
Earned level 50
Destroyed a Lancer while in a Racer
Reached Level 51
Killed an enemy plumber-style
Defeated the Interplanetary Ninja Assassin Claptrap
Reached Level 61
Collected 5 3D glasses
Completed the Prove Yourself mission
Completed the "Braaaaaaaaaaaaains!" mission
Completed Tannis' crazy request
Emerged victorious from an arena match
Raced around the Ludicrous Speedway in record time
Killed each of the loot midgets
Killed Crawmerax the Invincible
Read all 6 claptrap statue placards
Completed all missions in Secret Armory
Reached the end of the larger challenge in The Gully coliseum
Reached the end of the larger challenge in the Hell-Burbia coliseum
Reached the end of the larger challenge in The Angelic Ruins coliseum
Reached the end of each of the 3 larger challenges with one character
Collected 15 claptrap bobbleheads
Collected 3 panties, 5 fish in a bag, and 15 pizzas
Found 25 claptrap oil cans