The bigger they are...
Defeat the boss in Act 1.
Vengeance is mine
Defeat the boss in Act 2.
Flyswatter
Defeat the boss in Act 3.
You and what army?
Defeat the boss in Act 4.
The whole crew
Complete a level with help from each of the four classes.
Legendary hero
Reach the max level.
Wingmen
Juggle an enemy together with another player.
Arsenal
Unlock 100 different weapons.
Ironhide
Unlock 30 different armors.
Gotta learn them all
Perform all the different combo finishers.
Gold medalist
Earn gold medals on all levels.
Can't touch this
Avoid getting hit during a battle sequence.
Heads up!
Avoid all falling rocks in the Citadel level.
Never back down
Complete all challenges using one character.
There's no David
Kill 20 large enemies while riding a mount.
Clean hands
Kill 100 enemies by using the environment.
Brute
Complete all levels as the Warrior.
Bow for hire
Complete all levels as the Ranger.
Master caster
Complete all levels as the Mage.
Crazy witch
Complete all levels as the Shaman.
Mutual benefit
Complete all levels in multiplayer.
Fore!
Uppercut 4 enemies into the air at the same time.
Bookworm
Spend at least 4 seconds on each page of the 'how to play' section.
Invincible
Complete all levels without dying.
Untouchable
Complete a level without taking any damage from enemies.
It's over 9,000!!!
Deal over 9,000 damage with a single attack.
Pesky carts
Avoid the minecarts in the Mine level.
Tank me later
Complete the Tank Garrison level without using the tank.
Hazmat
Avoid the acid attacks during the elevator ride in the Queen's Tower.
Deconstruction
Kill the mini-boss in the Lost Metropolis without being hit by it.
The remedy
Extreme rafting
Swimming instructor
Bad omen
