Full list of all 75 Borderlands 2 achievements. It takes around 150-200 hours to unlock all of the achievements in the base game on Windows.
The base game contains 50 achievements, and there are 5 DLC packs containing 25 achievements.
Completed all side missions.
Gunzerked continuously for 90 seconds.
Completed level 1 of all non-level-specific challenges with a single character.
Discovered all named locations.
Discovered all named locations in Eridium Blight, Arid Nexus, and Sawtooth Cauldron.
Discovered all named locations in Three Horns, Tundra Express, and Frostburn Canyon.
Allowed a goliath to level up four times before killing him.
Killed Donkey Mong.
Discovered all named locations in The Highlands, Thousand Cuts, and Wildlife Exploitation Preserve.
Killed 100 enemies with the Sabre turret.
Killed a flying enemy with a thrown Tediore weapon.
Reached level 50.
Phaselocked 100 enemies.
Killed a Chubby.
Discovered all named locations in Sanctuary, Opportunity, and Lynchwood.
Had Purple-rated gear or better equipped in every slot.
Remained in Zero's Decepti0n mode for ten seconds straight.
Got an item from Michael Mamaril.
Gave Claptrap a high five.
Reached level 25.
Completed Round 5 of any Circle of Slaughter.
Tipped Moxxi $10,000.
Unlocked 10 customization items.
Purchased 5 items from the black market.
Redeemed 25 tokens.
Killed a Constructor without it ever building another bot.
Completed 20 side missions.
Reached level 10.
Reached level 5.
Revived someone from "Fight for Your Life!" that is on your friends list.
Won the most challenging round in Murderlin's Temple.
Wielded the Mysterious Amulet.
Vanquished the Ancient Dragons of Destruction.
Fed thy noble queen 3 times during one visit to her quarters.
Demonstrated your skill, or lack thereof, at rolling the magical treasure orb of many sides.
Completed thy quest by rescuing yonder queen.
Showed thine worst enemy, the abomination known as "The Darkness", who is the nerdiest of them all.
Unsheathed 5 swords from Immortal Skeletaurs without leaving the area.
Introduced thyself to the White Knight.
Slew Mister Boney Pants Guy.
Completed all Hammerlock's Hunt side missions.
Discovered all named locations in Hammerlock's Hunt.
Completed the mission "The Fall of Nakayama".
Completed all Campaign of Carnage side missions.
Completed the mission "Long Way To The Top".
Collected 10 pictures of Moxxi in Campaign of Carnage.
Completed all Pirate's Booty side missions.
Discovered all named locations in Oasis and the surrounding Pirate's Booty zones.
Completed the mission "X Marks the Spot".
Defeat Haderax the Invincible.
Defeat the Dark Web.
Complete the mission "Paradise Found".
Allow Tiny Tina to arm the moonshot cannon.
Activate the Backburner's firewall.