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