Full list of all 80 Borderlands Game of the Year Enhanced achievements. It takes around 60-80 hours to unlock all of the achievements on Windows.
Paid for a worthless tour of the world's largest bullet
I bet you never thought you'd be here
Collected 15 Claptrap bobbleheads
Found 25 oil cans
Collected 3 panties, 5 fish in a bag, and 15 pizzas
Completed a crazy request for Tannis
Found all 6 Claptrap statues
Killed the Interplanetary Ninja Assassin Claptrap
Killed Commandant Steele-trap
Killed Dr. Ned-trap
Killed General Knoxx-trap
Collected 5 3D glasses
Completed all missions in Secret Armory
Killed each of the loot midgets
Killed Crawmerax the Invincible
Destroyed Lance Depot
Rescued Athena
Destroyed a Lancer while in a Racer
Built the New Car: Monster
Mastered the technology of Pandora
Completed the larger challenge in The Angelic Ruins coliseum
Completed each of the larger challenges in all 3 coliseums
Completed the larger challenge in the Hell-Burbia coliseum
Completed the larger challenge in The Gully coliseum
Completed the lesser challenge in all 3 coliseums
Killed an enemy with the Siren's action skill
Killed 15 enemies with the Berserker's action skill
Killed 15 enemies with the Soldier's action skill
Killed 25 enemies with corrosive weapons
Play with at least two other players.
Raced around the Ludicrous Speedway in record time
Completed the "Braaaaaaaaaaaaains!" mission
Reached Level 61
Killed Ned. Again.
Killed Ned...sort of
Completed the "Jakobs Fodder" mission
Completed the "House of the Ned" mission
Reached Level 51
Earned level 50
Killed 25 enemies with shock weapons
Rescued enough Claptraps to earn 42 inventory slots
Earned level 40
Killed the Vault Boss
Discovered Eridian Promontory
Completed all missions in the Rust Commons
Discovered Crimson Lance Enclave
Killed Flynt
Killed the Rakk Hive
Discovered Trash Coast
Earned $1,000,000
Earned level 30
Killed Krom
Discovered The Scrapyard
Discovered Krom's Canyon
Sold 50 guns to a shop
Completed 5 missions in the Rust Commons
Reached proficiency level 10 with any weapon type
Killed 15 enemies with the Hunter's action skill
Earned level 20
Completed all missions in the Arid Badlands
Equipped a class mod for your character
Killed Sledge
Defeated the Rakk Hive, the Vault Boss, Sledge, Krom, or Flynt in a co-op game
Discovered Headstone Mine
Discovered Sledge's Safe House
Applied an elemental artifact
Killed 25 enemies with explosive weapons
Won a duel against another player
Won a duel without taking damage
Emerged victorious from an arena match
Killed 25 enemies by ramming them with any vehicle
Killed 5 Rakk in under 10 seconds
Earned level 10
Completed 15 missions in co-op
Killed 25 enemies with incendiary weapons
Earned level 5
Rescued a groupmate from death in a co-op game
Discovered Skag Gully
Completed 5 missions in the Arid Badlands
Killed an enemy plumber-style