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