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