The Konami Code
Go to the title screen and enter the Konami code, which you should remember is:
UP UP DOWN DOWN LEFT RIGHT LEFT RIGHT B A START
This will unlock some extra "wubs" which are worthless but cool to have. This is just like an Easter Egg.
Start and then finish the "A Dam Fine Rescue" quest and you will meet Sir Hammerlock. You will find him inside the Sanctuary and he will tell you about the "Mighty Morphin" quest. The new quest will require you to inject Varkid Cocoons with a special serum. Injecting the serum into a cocoon forces a large flying Badass version of a Varkid. Killing one yields 1900 XP. There is a glitch that lets you restart this quest over and over. Just keep killing all the cocoons, save the game, reload your game, and then repeat until you get as much experience as you need. This is over as soon as you complete the quest, so don't do it.
DLC Trophies: Tiny Tina's Assault On Dragon Keep
Dang Girl You Ace At This Game - Won the most challenging round in Murderlin's Temple - Silver
Girl's Gotta Eat - Fed thy noble queen 3 times during one visit to her quarters - Bronze
Hmmmmm - Wielded the Mysterious Amulet - Bronze
I Totes Planned That Boss - Slew Mister Boney Pants Guy - Bronze
It's Like That One Video - Showed thine worst enemy, the abomination known as "The Darkness," who is the nerdiest of them all - Bronze
Keep Rollin' Rollin' Rollin' - Demonstrated your skill, or lack thereof, at rolling the magical treasure orb of many sides - Bronze
Make it Raaaaaid - Vanquished the Ancient Dragons of Destruction - Silver
Shorty, You So Best - Completed thy quest by rescuing yonder queen - Silver
They Was All "Hey That's Mine" - Unsheathed 5 swords from Immortal Skeletaurs without leaving the area - Bronze
Yaaaaaay - Introduced thyself to the White Knight - Bronze
DLC Trophies: Sir Hammerlock's Big Game Hunt
Been There (45) - Discover all named locations in Hammerlock's Hunt
Done That (40) - Complete all Hammerlock's Hunt side missions
Face Off (40) - Complete the mission "The Fall of Nakayama"
A Road Less Traveled (Bronze) - Completed the mission "The Road To Sanctuary"
Always Improving (Silver) - Reached level 25
An Angel's Wish (Silver) - Completed the mission "Where Angels Fear To Tread"
An Old Flame (Bronze) - Completed the mission "Hunting The Firehawk"
Arctic Explorer (Bronze) - Discovered all named locations in Three Horns, Tundra Express, and Frostburn Canyon
Better Than Money (Bronze) - Purchased 5 items from the black market
Better Than You Were (Bronze) - Reached level 10
Blight Explorer (Bronze) - Discovered all named locations in Eridium Blight, Arid Nexus, and Sawtooth Cauldron
Bombs Away (Silver) - Completed the mission "Toil And Trouble"
Borderland Defender Round Two (Platinum) - Unlocked all Borderlands 2 trophies
Bounty Hunter (Bronze) - Completed 20 side missions
Build Buster (Bronze) - Killed a Constructor without it ever building another bot
Can See My House From Here (Bronze) - Completed the mission "Bright Lights, Flying City"
Capped Out…For Now (Silver) - Reached level 50
Challenge Accepted (Gold) - Completed level 1 of all non-level-specific challenges with a single character
Cool Story, Bro (Gold) - Defeated Jack
Cute Loot (Bronze) - Killed a Chubby
Decked Out (Bronze) - Had Purple-rated gear or better equipped in every slot
Definitely An Italian Plumber (Bronze) - Killed Donkey Mong
Did It All (Silver) - Completed all side missions
Dragon Slayer (Bronze) - Completed the mission "Best Minion Ever"
Farewell, Old Girl (Bronze) - Completed the mission "Wildlife Preservation"
Feels Like The First Time (Bronze) - Opened the chest at the bus stop in Fyrestone
First One's Free (Bronze) - Completed the mission "My First Gun"
Friendship Rules (Bronze) - Revived someone from "Fight for Your Life!" that is on your friends list
Goliath, Meet David (Bronze) - Allowed a Goliath to level up four times before killing him
Got The Band Back Together (Bronze) - Completed the mission "The Once and Future Slab"
High-Flying Hurler (Bronze) - Killed a flying enemy with a thrown Tediore weapon
Highlands Explorer (Bronze) - Discovered all named locations in The Highlands, Thousand Cuts, and Wildlife Exploitation Preserve
How Do I Look? (Bronze) - Unlocked 10 customization items
Identity Theft (Silver) - Completed the mission "The Man Who Would Be Jack"
Knowing Is Half The Battle (Silver) - Completed the mission "Data Mining"
New In Town (Bronze) - Completed the mission "Plan B"
No Man Left Behind (Bronze) - Completed the mission "A Dam Fine Rescue"
Not Quite Dead (Bronze) - Reached level 5
Phased and Confused (Bronze) - Phaselocked 100 enemies
Sabre Rattler (Bronze) - Killed 100 enemies with the Sabre turret
Sky's The Limit (Bronze) - Completed the mission "Rising Action"
So Much Blood! (Bronze) - Gunzerked continuously for 90 seconds
Sugar Daddy (Bronze) - Tipped Moxxi $10,000
Thresher Thrashed (Silver) - Defeated Terramorphous the Invincible
Token Gesture (Bronze) - Redeemed 25 tokens
Tribute To A Vault Hunter (Bronze) - Got an item from Michael Mamaril
Unseen Predator (Bronze) - Remained in Zero's Deception mode for ten seconds straight
Up High, Down Low (Bronze) - Gave Claptrap a high five
Urban Explorer (Bronze) - Discovered all named locations in Sanctuary, Opportunity, and Lynchwood
Well That Was Easy (Bronze) - Completed the mission "Shoot This Guy in the Face"
Went Five Rounds (Bronze) - Completed Round 5 of any Circle of Slaughter
What does it mean? (Bronze) - I can't even capture it on my camera
Wilhelm Screamed (Bronze) - Completed the mission "A Train To Catch"
World Traveler (Silver) - Discovered all named locations