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