Full list of all 70 Borderlands (JP) achievements worth 1,500 gamerscore. It takes around 20-25 hours to unlock all of the achievements in the base game.
The base game contains 50 achievements worth 1,000 Gamerscore, and there are 3 DLC packs containing 20 achievements worth 500 Gamerscore.
Complete 15 missions in co-op
Killed 15 enemies with the Hunter's action skill
Play in a co-op game with either an employee of Gearbox or someone who has this achievement
Raced around the Ludicrous Speedway in record time
Rescue a groupmate from death in a co-op game
Won a duel against another player
Won a duel without taking damage
Emerged victorious from an arena match
Completed all missions in the Arid Badlands
Earned level 20
Equipped a class mod for your character
Killed Sledge
Discovered Headstone Mine
Applied an elemental artifact
Kill 25 enemies with shock weapons
Mastered the technology of Pandora
Discovered Sledge's Safe House
Killed an enemy plumber-style
Sold 50 guns to a shop
Killed 25 enemies with explosive weapons
Killed 25 enemies by ramming them with any vehicle
Earned level 10
Killed 25 enemies with incendiary weapons
Killed 5 Rakk in under 10 seconds
Killed 15 enemies with the Soldier's action skill
Earned level 5
Discovered Skag Gully
Completed 5 missions in the Arid Badlands
Complete 5 missions in the Rust Commons
Complete all missions in the Rust Commons
Killed Krom
Killed Flynt
Killed the Rakk Hive
Killed the Vault Boss
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
Earn $1,000,000
Defeat the Rakk Hive, the Vault Boss, Sledge, Krom, or Flynt in a co-op game
Reach proficiency level 10 with any weapon type
I bet you never thought you'd be here.
Kill 25 enemies with corrosive weapons
Rescue enough Claptraps to earn 42 inventory slots
Kill an enemy with the Siren's action skill
Kill 15 enemies with the Berserker's action skill
Complete the "House of the Ned" mission
Complete the "Jakobs Fodder" mission
Kill Ned
Actually kill Ned
Complete the "Braaaaaaaaaaaaains!" mission
Complete the Prove Yourself mission
Reach the end of the larger challenge in the Hell-Burbia coliseum
Reach the end of the larger challenge in The Angelic Ruins coliseum
Reach the end of the larger challenge in The Gully coliseum
Reach the end of each of the 3 larger challenges with one character
Build the New Car: Monster
Rescue Athena
Destroy the 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
Pay for a worthless tour of the world's largest bullet