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.
Reached level 50.
Remained in Zero's Decepti0n mode for ten seconds straight.
Killed Donkey Mong.
Discovered all named locations.
Discovered all named locations in Eridium Blight, Arid Nexus, and Sawtooth Cauldron.
Gunzerked continuously for 90 seconds.
Had Purple-rated gear or better equipped in every slot.
Discovered all named locations in The Highlands, Thousand Cuts, and Wildlife Exploitation Preserve.
Discovered all named locations in Three Horns, Tundra Express, and Frostburn Canyon.
Got an item from Michael Mamaril.
Phaselocked 100 enemies.
Allowed a goliath to level up four times before killing him.
Completed all side missions.
Discovered all named locations in Sanctuary, Opportunity, and Lynchwood.
Reached level 25.
Killed a flying enemy with a thrown Tediore weapon.
Tipped Moxxi $10,000.
Completed Round 5 of any Circle of Slaughter.
Killed 100 enemies with the Sabre turret.
Killed a Constructor without it ever building another bot.
Purchased 5 items from the black market.
Redeemed 25 tokens.
Killed a Chubby.
Completed 20 side missions.
Reached level 10.
Gave Claptrap a high five.
Revived someone from "Fight for Your Life!" that is on your friends list.
Unlocked 10 customization items.
Reached level 5.
Completed level 1 of all non-level-specific challenges with a single character.
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.
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.
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.
Discovered all named locations in Oasis and the surrounding Pirate's Booty zones.
Completed all Pirate's Booty side missions.
Completed the mission "X Marks the Spot".
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.