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.
Completed level 1 of all non-level-specific challenges with a single character.
Discovered all named locations.
Discovered all named locations in Three Horns, Tundra Express, and Frostburn Canyon.
Discovered all named locations in Eridium Blight, Arid Nexus, and Sawtooth Cauldron.
Discovered all named locations in The Highlands, Thousand Cuts, and Wildlife Exploitation Preserve.
Allowed a goliath to level up four times before killing him.
Killed Donkey Mong.
Got an item from Michael Mamaril.
Gunzerked continuously for 90 seconds.
Killed 100 enemies with the Sabre turret.
Phaselocked 100 enemies.
Remained in Zero's Decepti0n mode for ten seconds straight.
Reached level 50.
Killed a flying enemy with a thrown Tediore weapon.
Killed a Chubby.
Had Purple-rated gear or better equipped in every slot.
Discovered all named locations in Sanctuary, Opportunity, and Lynchwood.
Reached level 25.
Completed Round 5 of any Circle of Slaughter.
Killed a Constructor without it ever building another bot.
Tipped Moxxi $10,000.
Purchased 5 items from the black market.
Completed 20 side missions.
Redeemed 25 tokens.
Revived someone from "Fight for Your Life!" that is on your friends list.
Gave Claptrap a high five.
Reached level 10.
Reached level 5.
Unlocked 10 customization items.
Showed thine worst enemy, the abomination known as "The Darkness", who is the nerdiest of them all.
Wielded the Mysterious Amulet.
Demonstrated your skill, or lack thereof, at rolling the magical treasure orb of many sides.
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.
Completed thy quest by rescuing yonder queen.
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".
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".