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