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