Full list of all 75 Borderlands 2 achievements worth 1,875 gamerscore. It takes around 60-80 hours to unlock all of the achievements in the base game.
The base game contains 69 achievements worth 1,625 Gamerscore, and there is 1 DLC pack containing 6 achievements worth 250 Gamerscore.
Completed the mission "Rising Action"
Completed the mission "A Train To Catch"
Phaselocked 100 enemies
Collected 10 pictures of Moxxi in Campaign of Carnage
Defeated Jack
Killed a Chubby
Completed the mission "Shoot This Guy in the Face"
Killed 100 enemies with the Sabre turret
Gunzerked continuously for 90 seconds
Completed the mission "A Dam Fine Rescue"
Completed the mission "Long Way To The Top"
Discovered all named locations in Hammerlock's Hunt
Completed the mission "The Fall of Nakayama"
Revived someone from "Fight for Your Life!" that is on your friends list
Completed level 1 of all non-level-specific challenges with a single character
Completed the mission "X Marks the Spot"
Discovered all named locations in Oasis and the surrounding Pirate's Booty zones
Completed the mission "Hunting The Firehawk"
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
Showed thine worst enemy, the abomination known as "The Darkness," who is the nerdiest of them all
Demonstrated your skill, or lack thereof, at rolling the magical treasure orb of many sides
Introduced thyself to the White Knight
Slew Mister Boney Pants Guy
Opened the chest at the bus stop in Fyrestone
I can't even capture it on my camera
Killed a Constructor without it ever building another bot
Had Purple-rated gear or better equipped in every slot
Killed Donkey Mong
Allowed a Goliath to level up four times before killing him
Gave Claptrap a high five
Discovered all named locations
Completed the mission "My First Gun"
Killed a flying enemy with a thrown Tediore weapon
Completed Round 5 of any Circle of Slaughter
Unlocked 10 customization items
Completed the mission "Plan B"
Purchased 5 items from the black market
Tipped Moxxi $10,000
Completed the mission "The Road To Sanctuary"
Redeemed 25 tokens
Completed the mission "Best Minion Ever"
Reached level 5
Reached level 10
Reached level 25
Remained in Zero's Deception mode for ten seconds straight
Completed 20 side missions
Discovered all named locations in Three Horns, Tundra Express, and Frostburn Canyon
Discovered all named locations in Sanctuary, Opportunity, and Lynchwood
Discovered all named locations in The Highlands, Thousand Cuts, and Wildlife Exploitation Preserve
Discovered all named locations in Eridium Blight, Arid Nexus, and Sawtooth Cauldron
Hidden
Reach level 50
Get an item from Michael Mamaril
Complete all side missions
Complete all Pirate's Booty side missions
Complete all Campaign of Carnage side missions
Complete all Hammerlock's Hunt side missions
Win the most challenging round in Murderlin's Temple
Wield the Mysterious Amulet
Vanquish the Ancient Dragons of Destruction
Completed the mission "Paradise Found".
Allowed Tiny Tina to arm the moonshot cannon.
Activated the Backburner's firewall.
Defeat Haderax the Invincible.
Defeat the Dark Web.
Equip effervescent-quality gear in all slots (except class mod).