Here is the full list of all 80 Borderlands: Game of the Year Edition achievements worth 1,750 gamerscore.
Killed the Interplanetary Ninja Assassin Claptrap
Killed Commandant Steele-trap
Killed Dr. Ned-trap
Killed General Knoxx-trap
Destroyed Lance Depot
Killed each of the loot midgets
Rescued Athena
Raced around the Ludicrous Speedway in record time
Built the New Car: Monster
Killed Ned. Again.
Killed Ned...sort of
Earned level 40
Completed the "Jakobs Fodder" mission
Completed the "House of the Ned" mission
Killed the Vault Boss
Discovered Eridian Promontory
Discovered Crimson Lance Enclave
Killed Flynt
Killed the Rakk Hive
Discovered Trash Coast
Killed 25 enemies with corrosive weapons
Earned $1,000,000
Earned level 30
Killed Krom
Reached proficiency level 10 with any weapon type
Discovered Krom's Canyon
I bet you never thought you'd be here
Discovered The Scrapyard
Killed 5 Rakk in under 10 seconds
Completed 5 missions in the Rust Commons
Killed 25 enemies with shock weapons
Completed all missions in the Arid Badlands
Earned level 20
Defeated the Rakk Hive, the Vault Boss, Sledge, Krom, or Flynt in a co-op game
Killed Sledge
Equipped a class mod for your character
Sold 50 guns to a shop
Discovered Headstone Mine
Killed 25 enemies with incendiary weapons
Applied an elemental artifact
Discovered Sledge's Safe House
Rescued a groupmate from death in a co-op game
Earned level 10
Completed 15 missions in co-op
Killed 15 enemies with the Berserker's action skill
Earned level 5
Killed 25 enemies with explosive weapons
Discovered Skag Gully
Completed 5 missions in the Arid Badlands
Complete all missions in the Rust Commons
Kill an enemy plumber-style
Master the technology of Pandora
Earn level 50
Kill 25 enemies by ramming them with any vehicle
Emerge victorious from an arena match
Win a duel against another player
Play with at least two other players.
Win a duel without taking damage
Rescue enough Claptraps to earn 42 inventory slots
Kill an enemy with the Siren's action skill
Kill 15 enemies with the Hunter's action skill
Kill 15 enemies with the Soldier's action skill
Complete the "Braaaaaaaaaaaaains!" mission
Complete the lesser challenge in all 3 coliseums
Complete the larger challenge in the Hell-Burbia coliseum
Complete the larger challenge in The Angelic Ruins coliseum
Complete the larger challenge in The Gully coliseum
Complete each of the larger challenges in all 3 coliseums
Kill Crawmerax the Invincible
Destroy a Lancer while in a Racer
Reach Level 51
Reach Level 61
Complete all missions in Secret Armory
Paid for a worthless tour of the world's largest bullet
Find all 6 Claptrap statues
Complete a crazy request for Tannis
Find 25 oil cans
Collect 15 Claptrap bobbleheads
Collect 5 3D glasses
Collect 3 panties, 5 fish in a bag, and 15 pizzas