Here is the full list of all 80 Borderlands: Game of the Year Edition achievements worth 1,750 gamerscore.
Completed the larger challenge in The Gully coliseum
Completed each of the larger challenges in all 3 coliseums
Completed the larger challenge in The Angelic Ruins coliseum
Killed each of the loot midgets
Completed the larger challenge in the Hell-Burbia coliseum
Completed the lesser challenge in all 3 coliseums
Killed Crawmerax the Invincible
Collected 3 panties, 5 fish in a bag, and 15 pizzas
Found 25 oil cans
Collected 15 Claptrap bobbleheads
Played with at least two other players.
Killed an enemy plumber-style
Destroyed a Lancer while in a Racer
Destroyed Lance Depot
Paid for a worthless tour of the world's largest bullet
Rescued Athena
Built the New Car: Monster
Reached Level 61
Found all 6 Claptrap statues
Reached Level 51
Earned level 50
Raced around the Ludicrous Speedway in record time
Completed the "Braaaaaaaaaaaaains!" mission
Killed Ned. Again.
Killed Ned...sort of
Completed the "Jakobs Fodder" mission
Completed the "House of the Ned" mission
Killed the Rakk Hive
Completed a crazy request for Tannis
Killed the Interplanetary Ninja Assassin Claptrap
Killed Commandant Steele-trap
Killed Dr. Ned-trap
Killed General Knoxx-trap
Earned level 40
Collected 5 3D glasses
Killed 25 enemies with corrosive weapons
Won a duel without taking damage
Won a duel against another player
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
Discovered Trash Coast
Earned level 30
Earned $1,000,000
Killed Krom
Discovered Krom's Canyon
I bet you never thought you'd be here
Discovered The Scrapyard
Reached proficiency level 10 with any weapon type
Completed 5 missions in the Rust Commons
Completed all missions in the Arid Badlands
Earned level 20
Mastered the technology of Pandora
Applied an elemental artifact
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
Killed 25 enemies with explosive weapons
Discovered Headstone Mine
Killed 25 enemies with shock weapons
Discovered Sledge's Safe House
Killed 5 Rakk in under 10 seconds
Killed 25 enemies by ramming them with any vehicle
Sold 50 guns to a shop
Earned level 10
Completed 15 missions in co-op
Killed 15 enemies with the Hunter's action skill
Killed 25 enemies with incendiary weapons
Rescued a groupmate from death in a co-op game
Discovered Skag Gully
Earned level 5
Completed 5 missions in the Arid Badlands
Emerge victorious from an arena match
Kill an enemy with the Siren's action skill
Kill 15 enemies with the Berserker's action skill
Kill 15 enemies with the Soldier's action skill
Complete all missions in Secret Armory