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