Here is the full list of all 80 Borderlands: Game of the Year Edition achievements worth 1,750 gamerscore.
Raced around the Ludicrous Speedway in record time
Completed the larger challenge in The Angelic Ruins coliseum
Completed each of the larger challenges in all 3 coliseums
Completed the larger challenge in The Gully coliseum
Completed all missions in Secret Armory
Emerged victorious from an arena match
Completed the larger challenge in the Hell-Burbia coliseum
Reached Level 61
Killed the Interplanetary Ninja Assassin Claptrap
Killed Commandant Steele-trap
Killed Dr. Ned-trap
Killed General Knoxx-trap
Completed a crazy request for Tannis
Reached Level 51
Earned level 50
I bet you never thought you'd be here
Completed the lesser challenge in all 3 coliseums
Killed Crawmerax the Invincible
Destroyed Lance Depot
Defeated the Rakk Hive, the Vault Boss, Sledge, Krom, or Flynt in a co-op game
Killed each of the loot midgets
Paid for a worthless tour of the world's largest bullet
Destroyed a Lancer while in a Racer
Killed 15 enemies with the Berserker's action skill
Collected 5 3D glasses
Collected 15 Claptrap bobbleheads
Found 25 oil cans
Collected 3 panties, 5 fish in a bag, and 15 pizzas
Found all 6 Claptrap statues
Killed 15 enemies with the Hunter's action skill
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
Rescued enough Claptraps to earn 42 inventory slots
Killed an enemy plumber-style
Killed the Vault Boss
Discovered Eridian Promontory
Completed all missions in the Rust Commons
Discovered Crimson Lance Enclave
Killed Flynt
Earned level 30
Killed the Rakk Hive
Discovered Trash Coast
Earned $1,000,000
Killed Krom
Reached proficiency level 10 with any weapon type
Discovered Krom's Canyon
Discovered The Scrapyard
Completed 5 missions in the Rust Commons
Completed all missions in the Arid Badlands
Killed 25 enemies by ramming them with any vehicle
Earned level 20
Killed 25 enemies with corrosive weapons
Equipped a class mod for your character
Killed Sledge
Discovered Headstone Mine
Mastered the technology of Pandora
Discovered Sledge's Safe House
Applied an elemental artifact
Won a duel against another player
Won a duel without taking damage
Sold 50 guns to a shop
Killed 25 enemies with shock weapons
Completed 15 missions in co-op
Played with at least two other players.
Killed an enemy with the Siren's action skill
Rescued a groupmate from death in a co-op game
Earned level 10
Killed 15 enemies with the Soldier's action skill
Killed 25 enemies with incendiary weapons
Killed 5 Rakk in under 10 seconds
Discovered Skag Gully
Earned level 5
Killed 25 enemies with explosive weapons
Completed 5 missions in the Arid Badlands