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