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