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