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