| Achievement | How to unlock
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| All Aboard | Kill 1,000 orcs with minecarts.
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| BFFs | Reach wave 40 in a co-op endless mode level.
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| Big Spender | Spend 100 skulls in the tome.
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| Cash Money Skulls | Spend 1000 skulls in the tome.
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| Droppin' Hamiltons | Spend 10 skulls in the tome.
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| Freedom! | Use the freedom trinket to break a co-op partner out of a stun.
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| Friends 'Till the End | Complete Twisted Halls in co-op.
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| Halfway There | Complete campaign, Act 1.
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| I Could Do This All Day | Kill 25,000 Orcs.
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| I'm So Awesome | Complete campaign, Act 2 Nightmare.
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| Impossible! | Reach wave 50 in an endless mode level.
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| Indecisive | Respec your character.
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| Kingdom Rush | Beat a nightmare level using only weapons, trinkets, and the dwarf, archer, and paladin minions.
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| May I Have Some More? | Kill 50,000 Orcs.
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| MMMMONSTER KILL! | Get a 25 kill streak.
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| Perfectionist | Earn 5 (base) skulls on every campaign level on War Mage difficulty.
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| Pot of Gold | Get a 10x or higher combo.
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| Predator | Collect 30 dropped skulls.
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| Queen of the Orcs | Charm 100 orcs as the Sorceress.
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| Restoring Order | Complete campaign, Act 2.
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| Six Degrees | Catch the Robot disease.
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| Stay Classy | Complete all classic levels.
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| Ten at Once | Get a 10 kill streak.
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| Thanks Bro | Heal an ally in co-op.
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| They Just Keep Coming | Reach wave 25 in an endless mode level.
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| Tough Going | Complete campaign, Act 1 Nightmare.
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| What is Best in Life? | Use the berserker trinket to reduce your health below 15%.
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