Full list of all 69 Borderlands 2 achievements worth 1,625 gamerscore. It takes around 40-50 hours to unlock all of the achievements in the base game.
The base game contains 50 achievements worth 1,000 Gamerscore, and there are 4 DLC packs containing 19 achievements worth 625 Gamerscore.
Achievements they've won
Achievements they've not won
Gunzerk continuously for 90 seconds
Kill 100 enemies with the Sabre turret
Phaselock 100 enemies
Complete all side missions
Complete level 1 of all non-level-specific challenges with a single character
Discover all named locations
Discover all named locations in Eridium Blight, Arid Nexus, and Sawtooth Cauldron
Discover all named locations in Three Horns, Tundra Express, and Frostburn Canyon
Discover all named locations in The Highlands, Thousand Cuts, and Wildlife Exploitation Preserve
Defeated Terramorphous the Invincible
Reach level 50
Allow a Goliath to level up four times before killing him
Have Purple-rated gear or better equipped in every slot
Discover all named locations in Sanctuary, Opportunity, and Lynchwood
Opened the chest at the bus stop in Fyrestone
Kill a Chubby
Complete Round 5 of any Circle of Slaughter
I can't even capture it on my camera
Completed the mission "Data Mining"
Revive someone from "Fight for Your Life!" that is on your friends list
Completed the mission "Toil And Trouble"
Reach level 25
Kill Donkey Mong
Give Claptrap a high five
Get an item from Michael Mamaril
Completed the mission "Where Angels Fear To Tread"
Kill a Constructor without it ever building another bot
Tip Moxxi $10,000
Completed the mission "The Man Who Would Be Jack"
Completed the mission "The Once and Future Slab"
Completed the mission "Shoot This Guy in the Face"
Completed the mission "Wildlife Preservation"
Completed the mission "Rising Action"
Purchase 5 items from the black market
Completed the mission "Bright Lights, Flying City"
Completed the mission "A Train To Catch"
Complete 20 side missions
Redeem 25 tokens
Completed the mission "A Dam Fine Rescue"
Kill a flying enemy with a thrown Tediore weapon
Remain in Zero's Deception mode for ten seconds straight
Completed the mission "Hunting The Firehawk"
Reach level 10
Completed the mission "Plan B"
Completed the mission "The Road To Sanctuary"
Completed the mission "Best Minion Ever"
Reach level 5
Unlock 10 customization items
Completed the mission "My First Gun"
Discover all named locations in Oasis and the surrounding Pirate's Booty zones
Complete all Pirate's Booty side missions
Complete the mission "X Marks the Spot"
Complete all Campaign of Carnage side missions
Complete the mission "Long Way To The Top"
Collect 10 pictures of Moxxi in Campaign of Carnage
Complete all Hammerlock's Hunt side missions
Discover all named locations in Hammerlock's Hunt
Complete the mission "The Fall of Nakayama"
Demonstrate your skill, or lack thereof, at rolling the magical treasure orb of many sides
Wield the Mysterious Amulet
Vanquish the Ancient Dragons of Destruction
Win the most challenging round in Murderlin's Temple
Feed thy noble queen 3 times during one visit to her quarters
Complete thy quest by rescuing yonder queen
Show thine worst enemy, the abomination known as "The Darkness," who is the nerdiest of them all
Unsheath 5 swords from Immortal Skeletaurs without leaving the area
Introduce thyself to the White Knight
Slay Mister Boney Pants Guy