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