Full list of all 75 Borderlands 2 achievements. It takes around 80-100 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.
Had Purple-rated gear or better equipped in every slot.
Got an item from Michael Mamaril.
Killed 100 enemies with the Sabre turret.
Killed Donkey Mong.
Killed a flying enemy with a thrown Tediore weapon.
Gave Claptrap a high five.
Discovered all named locations in Three Horns, Tundra Express, and Frostburn Canyon.
Reached level 50.
Killed a Chubby.
Tipped Moxxi $10,000.
Discovered all named locations in Sanctuary, Opportunity, and Lynchwood.
Completed Round 5 of any Circle of Slaughter.
Reached level 25.
Killed a Constructor without it ever building another bot.
Completed 20 side missions.
Allowed a goliath to level up four times before killing him.
Redeemed 25 tokens.
Purchased 5 items from the black market.
Unlocked 10 customization items.
Phaselocked 100 enemies.
Reached level 10.
Revived someone from "Fight for Your Life!" that is on your friends list.
Reached level 5.
Completed level 1 of all non-level-specific challenges with a single character.
Discovered all named locations in The Highlands, Thousand Cuts, and Wildlife Exploitation Preserve.
Discovered all named locations in Eridium Blight, Arid Nexus, and Sawtooth Cauldron.
Discovered all named locations.
Gunzerked continuously for 90 seconds.
Remained in Zero's Decepti0n mode for ten seconds straight.
Completed all side missions.
Showed thine worst enemy, the abomination known as "The Darkness", who is the nerdiest of them all.
Fed thy noble queen 3 times during one visit to her quarters.
Completed thy quest by rescuing yonder queen.
Wielded the Mysterious Amulet.
Unsheathed 5 swords from Immortal Skeletaurs without leaving the area.
Introduced thyself to the White Knight.
Slew Mister Boney Pants Guy.
Won the most challenging round in Murderlin's Temple.
Demonstrated your skill, or lack thereof, at rolling the magical treasure orb of many sides.
Vanquished the Ancient Dragons of Destruction.
Completed the mission "The Fall of Nakayama".
Completed all Hammerlock's Hunt side missions.
Discovered all named locations in Hammerlock's Hunt.
Collected 10 pictures of Moxxi in Campaign of Carnage.
Completed the mission "Long Way To The Top".
Completed all Campaign of Carnage side missions.
Completed the mission "X Marks the Spot".
Discovered all named locations in Oasis and the surrounding Pirate's Booty zones.
Completed all Pirate's Booty side missions.
Allow Tiny Tina to arm the moonshot cannon.
Activate the Backburner's firewall.
Defeat Haderax the Invincible.
Defeat the Dark Web.
Complete the mission "Paradise Found".