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.
Discovered all named locations.
Discovered all named locations in Eridium Blight, Arid Nexus, and Sawtooth Cauldron.
Discovered all named locations in Sanctuary, Opportunity, and Lynchwood.
Discovered all named locations in The Highlands, Thousand Cuts, and Wildlife Exploitation Preserve.
Got an item from Michael Mamaril.
Killed Donkey Mong.
Reached level 50.
Had Purple-rated gear or better equipped in every slot.
Killed a flying enemy with a thrown Tediore weapon.
Discovered all named locations in Three Horns, Tundra Express, and Frostburn Canyon.
Completed Round 5 of any Circle of Slaughter.
Reached level 25.
Killed a Chubby.
Killed a Constructor without it ever building another bot.
Completed 20 side missions.
Tipped Moxxi $10,000.
Purchased 5 items from the black market.
Redeemed 25 tokens.
Killed 100 enemies with the Sabre turret.
Reached level 10.
Gave Claptrap a high five.
Unlocked 10 customization items.
Reached level 5.
Completed level 1 of all non-level-specific challenges with a single character.
Allowed a goliath to level up four times before killing him.
Phaselocked 100 enemies.
Gunzerked continuously for 90 seconds.
Remained in Zero's Decepti0n mode for ten seconds straight.
Revived someone from "Fight for Your Life!" that is on your friends list.
Completed all side missions.
Wielded the Mysterious Amulet.
Fed thy noble queen 3 times during one visit to her quarters.
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.
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.
Completed the mission "Long Way To The Top".
Completed all Campaign of Carnage side missions.
Collected 10 pictures of Moxxi in Campaign of Carnage.
Discovered all named locations in Oasis and the surrounding Pirate's Booty zones.
Completed the mission "X Marks the Spot".
Completed all Pirate's Booty side missions.
Activate the Backburner's firewall.
Allow Tiny Tina to arm the moonshot cannon.
Defeat Haderax the Invincible.
Defeat the Dark Web.
Complete the mission "Paradise Found".