Here is the full list of all 80 Borderlands: Game of the Year Edition achievements worth 1,750 gamerscore.
Complete 5 missions in the Arid Badlands
Complete all missions in the Arid Badlands
Complete 5 missions in the Rust Commons
Complete all missions in the Rust Commons
Kill an enemy plumber-style
Master the technology of Pandora
Kill Sledge
Kill Krom
Kill Flynt
Kill the Rakk Hive
Kill the Vault Boss
Race around the Ludicrous Speedway in record time
Apply an elemental artifact
Earn level 5
Earn level 10
Earn level 20
Earn level 30
Earn level 40
Discover Skag Gully
Discover Sledge's Safe House
Discover Headstone Mine
Discover Trash Coast
Discover The Scrapyard
Discover Krom's Canyon
Discover Crimson Lance Enclave
Discover Eridian Promontory
Earn level 50
Kill 25 enemies by ramming them with any vehicle
Kill 5 Rakk in under 10 seconds
Earn $1,000,000
Sell 50 guns to a shop
Emerge victorious from an arena match
Win a duel against another player
Rescue a groupmate from death in a co-op game
Complete 15 missions in co-op
Defeat the Rakk Hive, the Vault Boss, Sledge, Krom, or Flynt in a co-op game
Play with at least two other players.
Reach proficiency level 10 with any weapon type
I bet you never thought you'd be here
Win a duel without taking damage
Kill 25 enemies with corrosive weapons
Kill 25 enemies with shock weapons
Kill 25 enemies with incendiary weapons
Kill 25 enemies with explosive weapons
Equip a class mod for your character
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 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