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