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