| Achievement | How to unlock
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| Obtained high-grade materials | [Expert Undernaut Mission] You established yourself as a collector of A-rarity weapons and armor.
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| Obtained low-grade materials | [Novice Undernaut Mission] You established yourself as a collector of C-rarity weapons and armor.
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| Obtained mid-grade materials | [Standard Undernaut Mission] You established yourself as a collector of B-rarity weapons and armor.
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| Obtained special-grade materials | [Legendary Undernaut Mission] You established yourself as a collector of S-rarity weapons and armor.
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| Obtained starter-grade materials | [Rookie Undernaut Mission] You established yourself as a collector of D-rarity weapons and armor.
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| [Mission] Disposed of the Anguished Sinner | [Standard Undernaut Mission] You disposed of the Anguished Sinner.
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| [Mission] Disposed of the Desirous Sinner | [Standard Undernaut Mission] You disposed of the Desirous Sinner.
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| [Mission] Disposed of the Envious Sinner | [Standard Undernaut Mission] You disposed of the Envious Sinner.
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| [Mission] Disposed of the Gluttonous Sinner | [Novice Undernaut Mission] You disposed of the Gluttonous Sinner.
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| [Mission] Disposed of the Prideful Sinner | [Expert Undernaut Mission] You disposed of the Prideful Sinner.
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| [Mission] Disposed of the Reckless Sinner | [Novice Undernaut Mission] You disposed of the Reckless Sinner.
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| [Mission] Disposed of the Slothful Sinner | [Expert Undernaut Mission] You disposed of the Slothful Sinner.
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| [Mission] Disposed of the Violent Sinner | [Novice Undernaut Mission] You disposed of the Violent Sinner.
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| [Mission] Disposed of the Wrathful Sinner | [Expert Undernaut Mission] You disposed of the Wrathful Sinner.
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| [Mission] Escaped from Yomi | [Legendary Undernaut Mission] You escaped from Yomi.
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| [Mission] Reached the other company's camp | [Rookie Undernaut Mission] You reached the other company's camp.
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| [Mission] Returned to the surface | [Expert Undernaut Mission] You exited Yomi and returned to the surface.
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| [Mission] Returned to your company's camp | [Rookie Undernaut Mission] You returned to your company's camp.
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| [Mission] Revived the Divine Child | [Legendary Undernaut Mission] You revived the Divine Child.
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