This guide will help you to achieve 100% in Necrophosis.
Info
There are many more things in-game to discover not related to achievements and will be skipped here.
There is chapter select after finishing the game and everything missable can be collected without replaying whole game so feel free to experience the game without using this guide.
Chapter 1 – True waking

1. When prayer walking
2. When praying to any of 3 brains (next to both boys and hangman)
3. When praying in front of Red Cave before you enter inside
4. When praying in front of Red Cave after exit
5. When praying next to Khnum
6. When praying next to Gate
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Use machine on black creatures:
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Coin (1/5)
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Coin (2/5)
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Use coins on altar
Shrine (1/3)
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Skull (1/5)
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Spine (1/4)
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Skull (2/5)
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Storylined achievement
Chapter 2 – Beyond the gate
Tablet (2/7)

Tablet (3/7)


Stand on hand:
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Skull (3/5)
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Spine (2/4)
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Take that mask:
and give it back to that creature:
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Coin (3/5)
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Shrine (2/3)
Use coin here:
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Storylined achievement
Chapter 3 – Down below

Tablet (4/7) Go back here after taking crown


Tablet (5/7) Use cube here and read tablet
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Skull (4/5)
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Tablet (6/7)
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Storylined achievement
Chapter 4 – Blessing of creation


Enter red portal and examine bodies laying on a ground
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Sphere (2/3)
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Sphere (3/3)
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Coin (4/5)
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Coin (5/5)
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Use coins on altar
Shrine (3/3)
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Spine (4/4)
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Storylined achievement
Chapter 5 – Will of chaos


Storylined achievement
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Skull (5/5)
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Storylined achievement