| Achievement | How to unlock
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| - Complete every optional defense level on any difficulty.
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| - Acquire all Citadel upgrades from the Book of Insight.
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| - Complete all skirmish levels on Extreme difficulty.
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| - Kill 100 horrors during campaign.
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- Butcher, Baker, Candlestick Maker...
| - Complete a city-building level with at least one building of each type.
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| - Create and save a level in Sandbox Mode.
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| - Kill 50 horrors under collapsing pieces.
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| - Summon 15 echoes during a level.
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| - Complete 'the Defense of Hogar' on any difficulty.
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| - Have 75 units at your command during a city-building level.
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- Following A Lost Trail...
| - Complete 'Lost Pages' on any difficulty.
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| - Complete all campaign levels on Extreme difficulty.
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| - Complete the opening level on any difficulty.
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| - Complete 'Downpour' on any difficulty.
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- I Can See My Shack From Up Here!
| - Deploy a unit 25m from the ground.
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| - Kill 5 Sirenas during campaign.
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| - Complete all campaign levels on Hard difficulty.
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| - Discover all lost pages from Aura's expedition
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| - Discover a lost page from an ill-fated expedition
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| - Reach maximum Prosperity in a city-building level.
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| - Create a squad of Hogardian units with at least one unit of each type.
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- Professional Exterminator
| - Kill 10000 horrors during campaign.
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| - Kill 1000 horrors during campaign.
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| - Earn the highest Expedition rank during campaign.
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| - Complete 'Into the Depths' on any difficulty.
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| - Witness Iris return to the Citadel from the brink of death.
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| - Acquire all skills for Iris from the Book of Insight.
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| - Acquire one skill for Iris and one upgrade for the Citadel using the Book of Insight.
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| - Complete all skirmish levels on any difficulty.
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| - Complete the campaign in less than eight hours on any difficulty.
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| - Complete the final level on any difficulty.
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| - Lose any level during campaign.
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| - Lose a soldier to a fall into the Depths.
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| - Complete 'Memorial' on any difficulty.
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| - Complete an optional defense level on any difficulty.
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| - Complete a city-building level on Hard without losing any units.
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| - Complete 'the Forest Garrison' on any difficulty.
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| - Find a familiar backpack...
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| - Complete an optional defense level on Medium or higher without using Stone pieces.
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| - Complete a city-building level without pausing.
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