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