Here is the full list of all 80 Borderlands: Game of the Year Edition achievements worth 1,750 gamerscore.
Reached Level 61
Reached Level 51
Equipped a class mod for your character
Earned level 20
Killed Sledge
Discovered Headstone Mine
Killed 15 enemies with the Hunter's action skill
Sold 50 guns to a shop
Applied an elemental artifact
Discovered Sledge's Safe House
Killed 5 Rakk in under 10 seconds
Killed an enemy plumber-style
Completed all missions in the Arid Badlands
Earned level 10
Discovered Skag Gully
Earned level 5
Completed 5 missions in the Arid Badlands
Killed 25 enemies by ramming them with any vehicle
Completed the "Braaaaaaaaaaaaains!" mission
Killed Ned. Again.
Killed Ned...sort of
Killed 25 enemies with incendiary weapons
Killed 25 enemies with corrosive weapons
Killed 25 enemies with explosive weapons
Killed 15 enemies with the Berserker's action skill
Mastered the technology of Pandora
Killed 25 enemies with shock weapons
Found 25 oil cans
Collected 3 panties, 5 fish in a bag, and 15 pizzas
Collected 15 Claptrap bobbleheads
Earned $1,000,000
Completed the "Jakobs Fodder" mission
Completed the "House of the Ned" mission
Collected 5 3D glasses
Found all 6 Claptrap statues
Complete 5 missions in the Rust Commons
Complete all missions in the Rust Commons
Kill Krom
Kill Flynt
Kill the Rakk Hive
Kill the Vault Boss
Race around the Ludicrous Speedway in record time
Earn level 30
Earn level 40
Discover Trash Coast
Discover The Scrapyard
Discover Krom's Canyon
Discover Crimson Lance Enclave
Discover Eridian Promontory
Earn level 50
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
Rescue enough Claptraps to earn 42 inventory slots
Kill an enemy with the Siren's action skill
Kill 15 enemies with the Soldier's action skill
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
Complete all missions in Secret Armory
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