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