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