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
Killed 15 enemies with the Hunter's action skill
Killed 15 enemies with the Berserker's action skill
Killed an enemy with the Siren's action skill
Earned level 50
I bet you never thought you'd be here
Raced around the Ludicrous Speedway in record time
Won a duel against another player
Won a duel without taking damage
Emerged victorious from an arena match
Defeated the Rakk Hive, the Vault Boss, Sledge, Krom, or Flynt in a co-op game
Completed 15 missions in co-op
Rescued a groupmate from death in a co-op game
Played in a co-op game with either an employee of Gearbox or someone who had this trophy
Rescued enough Claptraps to earn 42 inventory slots
Earned level 40
Killed an enemy plumber-style
Killed the Vault Boss
Discovered Eridian Promontory
Completed all missions in the Rust Commons
Discovered Crimson Lance Enclave
Killed Flynt
Earned $1,000,000
Earned level 30
Killed the Rakk Hive
Discovered Trash Coast
Killed 25 enemies with corrosive weapons
Reached proficiency level 10 with any weapon type
Killed Krom
Discovered Krom's Canyon
Discovered The Scrapyard
Completed 5 missions in the Rust Commons
Sold 50 guns to a shop
Completed all missions in the Arid Badlands
Killed 25 enemies with shock weapons
Equipped a class mod for your character
Killed Sledge
Earned level 20
Discovered Headstone Mine
Applied an elemental artifact
Mastered the technology of Pandora
Killed 25 enemies by ramming them with any vehicle
Killed 5 Rakk in under 10 seconds
Discovered Sledge's Safe House
Killed 25 enemies with explosive weapons
Earned level 10
Killed 15 enemies with the Soldier's action skill
Killed 25 enemies with incendiary weapons
Discovered Skag Gully
Earned level 5
Completed 5 missions in the Arid Badlands
Collected 3 panties, 5 fish in a bag, and 15 pizzas
Collected 15 Claptrap bobbleheads
Found 25 oil cans
Completed a crazy request for Tannis
Found all 6 Claptrap statues
Killed the Interplanatary Ninja Assassin Claptrap
Killed Commandant Steele-trap
Killed Dr. Ned-trap
Collected 5 3D glasses
Killed General Knoxx-trap
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
Killed each of the loot midgets
Completed all missions in Secret Armory
Killed Crawmerax the Invincible
Reached Level 61
Paid for a worthless tour of the world's largest bullet
Destroyed Lance Depot
Destroyed a Lancer while in a Racer
Rescued Athena
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