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