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