The bigger they are... 10 Defeated the boss in Act 1.
Vengeance is mine 10 Defeated the boss in Act 2.
Flyswatter 10 Defeated the boss in Act 3.
You and what army? 15 Defeated the boss in Act 4.
The whole crew 10 Completed a level with help from each of the four classes.
Legendary Hero 10 Reached the max level.
Wingmen 10 Juggled an enemy together with another player.
Arsenal 15 Unlocked 100 different weapons.
Ironhide 15 Unlocked 30 different armors.
Gotta learn them all 10 Performed all the different combo finishers.
Gold medalist 30 Earned gold medals on all the main game levels.
Can't touch this 10 Avoided getting hit during a battle sequence.
Heads up! 15 Avoided all falling rocks in the Citadel level.
Never back down 10 Completed all challenges using one character.
There's no David 15 Killed 20 large enemies while riding a mount.
Clean hands 15 Killed 100 enemies using the environment or traps.
Brute 10 Completed all levels as the Warrior.
Bow for hire 10 Completed all levels as the Ranger.
Master caster 10 Completed all levels as the Mage.
Crazy witch 10 Completed all levels as the Shaman.
Mutual benefit 15 Completed all levels in multiplayer.
Fore! 10 Uppercutted 4 enemies into the air at the same time.
Bookworm 10 Spent at least 4 seconds on each page of the 'how to play' section.
Invincible 20 Completed all levels without dying.
Untouchable 20 Completed a level without taking any damage from enemies.
It's over 9,000!!! 15 Dealt over 9,000 damage with a single attack.
Pesky carts 15 Avoided the minecarts in the Mine level.
Tank me later 15 Completed the Tank Garrison level without using the tank.
Hazmat 15 Avoided the acid attacks during the elevator ride in the Queen's Tower.
Deconstruction 15 Killed the mini-boss in the Lost Metropolis without being hit by it.
Jungle Hunt DLC:
The remedy 25 Defeat the boss in Act 5.
Extreme rafting 30 Avoid all obstacles during the raft ride.
Swimming instructor 15 Throw 10 enemies into the Naruvu River.
Bad omen 20 Complete all levels in the Jungle Hunt DLC without destroying any voodoo dolls.
Pool party 10 Jump into the piranha pool next to the boss.