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