Here is the full list of all 80 Borderlands: Game of the Year Edition achievements worth 1,750 gamerscore.
Won a duel against another player
Won a duel without taking damage
Emerged victorious from an arena match
Killed the Vault Boss
Discovered Eridian Promontory
Discovered Crimson Lance Enclave
Killed Flynt
Earned $1,000,000
Killed the Rakk Hive
Discovered Trash Coast
Earned level 30
Killed 25 enemies with corrosive weapons
Killed Krom
Discovered Krom's Canyon
Completed 5 missions in the Rust Commons
Discovered The Scrapyard
Killed 25 enemies with shock weapons
Reached proficiency level 10 with any weapon type
Earned level 20
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
Sold 50 guns to a shop
Discovered Headstone Mine
Killed 25 enemies with incendiary weapons
Rescued a groupmate from death in a co-op game
Applied an elemental artifact
Killed 25 enemies with explosive weapons
Discovered Sledge's Safe House
Killed 25 enemies by ramming them with any vehicle
Earned level 10
Completed 15 missions in co-op
Killed 15 enemies with the Hunter's action skill
Earned level 5
Discovered Skag Gully
Completed 5 missions in the Arid Badlands
Complete all missions in the Arid Badlands
Complete all missions in the Rust Commons
Kill an enemy plumber-style
Master the technology of Pandora
Race around the Ludicrous Speedway in record time
Earn level 40
Earn level 50
Kill 5 Rakk in under 10 seconds
Play with at least two other players.
I bet you never thought you'd be here
Rescue enough Claptraps to earn 42 inventory slots
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 the "House of the Ned" mission
Complete the "Jakobs Fodder" mission
Kill Ned...sort of
Kill Ned. Again.
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
Build a New Car: Monster
Rescue Athena
Destroy Lance Depot
Kill Crawmerax the Invincible
Kill each of the loot midgets
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
Kill General Knoxx-trap
Kill Commandant Steele-trap
Kill Dr. Ned-trap
Kill the Interplanetary Ninja Assassin Claptrap
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