Full list of all 81 Borderlands trophies - 59 bronze, 17 silver, 4 gold and 1 platinum.
The base game contains 51 trophies, and there are 5 DLC packs containing 30 trophies.
You have defeated all bosses and are a powerful force to be reckoned with
Earned level 50
Earned level 40
Completed 15 missions in co-op
Killed the Vault Boss
Discovered Eridian Promontory
Killed 15 enemies with the Berserker's action skill
Killed 15 enemies with the Soldier's action skill
Killed an enemy with the Siren's action skill
Rescued enough Claptraps to earn 42 inventory slots
Completed all missions in the Rust Commons
Discovered Crimson Lance Enclave
Killed Flynt
Killed the Rakk Hive
Discovered Trash Coast
Earned level 30
Killed Krom
Defeated the Rakk Hive, the Vault Boss, Sledge, Krom, or Flynt in a co-op game
Earned $1,000,000
Discovered Krom's Canyon
Mastered the technology of Pandora
I bet you never thought you'd be here
Reached proficiency level 10 with any weapon type
Discovered The Scrapyard
Played in a co-op game with either an employee of Gearbox or someone who had this trophy
Completed 5 missions in the Rust Commons
Killed 25 enemies with incendiary weapons
Killed 25 enemies with shock weapons
Killed 25 enemies with corrosive weapons
Completed all missions in the Arid Badlands
Raced around the Ludicrous Speedway in record time
Killed 15 enemies with the Hunter's action skill
Earned level 20
Equipped a class mod for your character
Killed Sledge
Sold 50 guns to a shop
Discovered Headstone Mine
Applied an elemental artifact
Discovered Sledge's Safe House
Killed 25 enemies with explosive weapons
Killed 25 enemies by ramming them with any vehicle
Earned level 10
Killed 5 Rakk in under 10 seconds
Rescued a groupmate from death in a co-op game
Emerged victorious from an arena match
Discovered Skag Gully
Earned level 5
Won a duel against another player
Won a duel without taking damage
Completed 5 missions in the Arid Badlands
Killed an enemy plumber-style
Collected 15 Claptrap bobbleheads
Found 25 oil cans
Collected 3 panties, 5 fish in a bag, and 15 pizzas
Completed a crazy request for Tannis
Killed the Interplanatary Ninja Assassin Claptrap
Killed Commandant Steele-trap
Killed Dr. Ned-trap
Found all 6 Claptrap statues
Killed General Knoxx-trap
Collected 5 3D glasses
Completed the larger challenge in The Angelic Ruins coliseum
Completed each of the larger challenges in all 3 coliseums
Completed the larger challenge in the Hell-Burbia coliseum
Completed the larger challenge in The Gully coliseum
Completed the lesser challenge in all 3 coliseums
Completed all missions in Secret Armory
Killed Crawmerax the Invincible
Killed each of the loot midgets
Reached Level 61
Destroyed Lance Depot
Rescued Athena
Paid for a worthless tour of the world's largest bullet
Destroyed a Lancer while in a Racer
Built the New Car: Monster
Completed the "Braaaaaaaaaaaaains!" mission
Killed Ned. Again.
Killed Ned...sort of
Completed the "Jakobs Fodder" mission
Completed the "House of the Ned" mission
Reached Level 51