Here is the complete list of the achievements that you will need to unlock during Borderlands 2.
Borderlands 2 comes pack with exiting gameplay and overall non-stop action. The following achievements will need to be unlocked, follow the decription for each of them and see what you need to do to unlock all of them in the game.
Borderlands 2 Achievements Guide
Challenge Accepted 30
Completed level 1 of all non-level-specific challenges with a single character
Goliath, Meet David 15
Allowed a Goliath to level up four times before killing him
Went Five Rounds 25
Completed Round 5 of any Circle of Slaughter
Not Quite Dead 5
Reached level 5
Better Than You Were 10
Reached level 10
Always Improving 25
Reached level 25
Capped Out…For Now 50
Reached level 50
Arctic Explorer 15
Discovered all named locations in Three Horns, Tundra Express, and Frostburn Canyon
Urban Explorer 15
Discovered all named locations in Sanctuary, Opportunity, and Lynchwood
Highlands Explorer 15
Discovered all named locations in The Highlands, Thousand Cuts, and Wildlife Exploitation Preserve
Blight Explorer 15
Discovered all named locations in Eridium Blight, Arid Nexus, and Sawtooth Cauldron
World Traveler 50
Discovered all named locations
Sugar Daddy 10
Tipped Moxxi $10,000
Decked Out 25
Had Purple-rated gear or better equipped in every slot
Sabre Rattler 20
Killed 100 enemies with the Sabre turret
Phased and Confused 20
Phaselocked 100 enemies
So Much Blood! 20
Gunzerked continuously for 90 seconds
Cute Loot 15
Killed a Chubby
Tribute To A Vault Hunter 15
Got an item from Michael Mamaril
Definitely An Italian Plumber 15
Killed Donkey Mong
High-Flying Hurler 10
Killed a flying enemy with a thrown Tediore weapon
Token Gesture 20
Redeemed 25 tokens
Unseen Predator 20
Remained in Zero’s Deception mode for ten seconds straight
Build Buster 20
Killed a Constructor without it ever building another bot
How Do I Look? 25
Unlocked 10 customization items
Friendship Rules 10
Revived someone from “Fight for Your Life!” that is on your friends list
Better Than Money 15
Purchased 5 items from the black market
Up High, Down Low 15
Gave Claptrap a high five
Bounty Hunter 25
Completed 20 side missions
Did It All 40
Completed all side missions