Borderlands 2

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.

What does it mean?

Hidden achievement

Unseen Predator

Remained in Zero's Decepti0n mode for ten seconds straight.

Build Buster

Killed a Constructor without it ever building another bot.

Well, That Was Easy

Hidden achievement

Thresher Thrashed

Hidden achievement

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.

Feels Like The First Time

Hidden achievement

Treasure Hunter

Completed the mission "X Marks the Spot".

Gadabout

Discovered all named locations in Oasis and the surrounding Pirate's Booty zones.

Completionist

Completed all Pirate's Booty side missions.

Explosive

Completed the mission "Long Way To The Top".

Motorhead

Completed all Campaign of Carnage side missions.

Obsessed

Collected 10 pictures of Moxxi in Campaign of Carnage.

Face Off

Completed the mission "The Fall of Nakayama".

Done That

Completed all Hammerlock's Hunt side missions.

Been There

Discovered all named locations in Hammerlock's Hunt.

I Totes Planned That Boss

Slew Mister Boney Pants Guy.

Yaaaaaay

Introduced thyself to the White Knight.

Shorty, You So Best

Completed thy quest by rescuing yonder queen.

Girl's Gotta Eat

Fed thy noble queen 3 times during one visit to her quarters.

It's Like That One Video

Showed thine worst enemy, the abomination known as "The Darkness", who is the nerdiest of them all.

They Was All "Hey That's Mine"

Unsheathed 5 swords from Immortal Skeletaurs without leaving the area.

Dang Girl You Ace At This Game

Won the most challenging round in Murderlin's Temple.

Hmmmmm

Wielded the Mysterious Amulet.

Keep Rollin' Rollin' Rollin'

Demonstrated your skill, or lack thereof, at rolling the magical treasure orb of many sides.

Make it Raaaaaid

Vanquished the Ancient Dragons of Destruction.

Anyway, Here's "Firewall"

Activate the Backburner's firewall.

Chocolate Chip Confirmed

Allow Tiny Tina to arm the moonshot cannon.

Spicy Boy

Defeat Haderax the Invincible.

Decrypted!

Defeat the Dark Web.

Painbow Connection

Hidden achievement

3 or Bust

Complete the mission "Paradise Found".