| Achievement | How to unlock
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| Begin | You have embarked on the journey of Alum.
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| Chapter 2 | You've reached chapter 2
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| Chapter 3 | You've reached chapter 3.
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| Chapter 4 | You've reached chapter 4.
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| Chapter 5 | You've reached chapter 5.
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| Chapter 6 | You've reached chapter 6.
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| Chapter 7 | You've reached chapter 7.
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| Colemin's Last Stand | You beat Colemin's Last Stand.
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| Dashu's Last Stand | You beat Dashu's Last Stand.
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| Defeat Og | Off with his head.
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| Free Kosmos | Congratulations! You beat the game.
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| Free Kosmos (no hints) | Wow! You beat the game without using hints.
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| Office Chair | The office chair is an office chair.
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| Pige! | You shared your rushlight with Pige.
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| Rushlight Bearer | You've received a rushlight.
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| Smoky-mountain maple mighty magic mac and cheese scented | Smoky-mountain maple mighty magic mac and cheese scented. Strange, yet satisfying.
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| Sniper Elite | You beat the sniper sequence.
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