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.
Reached level 50.
Discovered all named locations in Three Horns, Tundra Express, and Frostburn Canyon.
Discovered all named locations in Eridium Blight, Arid Nexus, and Sawtooth Cauldron.
Revived someone from "Fight for Your Life!" that is on your friends list.
Killed Donkey Mong.
Discovered all named locations in The Highlands, Thousand Cuts, and Wildlife Exploitation Preserve.
Allowed a goliath to level up four times before killing him.
Discovered all named locations in Sanctuary, Opportunity, and Lynchwood.
Had Purple-rated gear or better equipped in every slot.
Gave Claptrap a high five.
Reached level 25.
Tipped Moxxi $10,000.
Killed a Constructor without it ever building another bot.
Killed a flying enemy with a thrown Tediore weapon.
Killed a Chubby.
Completed 20 side missions.
Purchased 5 items from the black market.
Unlocked 10 customization items.
Redeemed 25 tokens.
Reached level 10.
Got an item from Michael Mamaril.
Reached level 5.
Completed level 1 of all non-level-specific challenges with a single character.
Completed Round 5 of any Circle of Slaughter.
Discovered all named locations.
Killed 100 enemies with the Sabre turret.
Phaselocked 100 enemies.
Gunzerked continuously for 90 seconds.
Remained in Zero's Decepti0n mode for ten seconds straight.
Completed all side missions.
Vanquished the Ancient Dragons of Destruction.
Wielded the Mysterious Amulet.
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.
Demonstrated your skill, or lack thereof, at rolling the magical treasure orb of many sides.
Fed thy noble queen 3 times during one visit to her quarters.
Won the most challenging round in Murderlin's Temple.
Completed the mission "The Fall of Nakayama".
Completed all Hammerlock's Hunt side missions.
Discovered all named locations in Hammerlock's Hunt.
Completed the mission "Long Way To The Top".
Collected 10 pictures of Moxxi in Campaign of Carnage.
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.
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.