Complete campaign, Act 1
Spend 100 skulls in the tome
Reach wave 25 in an endless mode level
Charm 100 orcs as the Sorceress
Get a 25 kill streak
Spend 10 skulls in the tome
Get a 10 kill streak
Heal an ally in co-op
Use the berserker trinket to reduce your health below 15%
Respec your character
Kill 1,000 orcs with minecarts
Get a 10x or higher combo
Beat a nightmare level using only weapons, trinkets, and the dwarf, archer, and paladin minions
Spend 1000 skulls in the tome
Earn 5 (base) skulls on every campaign level on War Mage difficulty
Use the freedom trinket to break a co-op partner out of a stun
Collect 30 dropped skulls
Complete Twisted Halls in co-op
Reach wave 40 in a co-op endless mode level
Reach wave 50 in an endless mode level
Complete all classic levels
Complete campaign, Act 2 Nightmare
Complete campaign, Act 1 Nightmare
Complete campaign, Act 2
Kill 50,000 Orcs
Kill 25,000 Orcs
Catch the Robot disease
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