Katana Zero 100% Achievement Guide + Secret Boss

This is my full walkthrough of Katana Zero with all the achievements (including Psychotherapy for sure), the secret boss fight and a guide to find all secret keys to unlock new weapons.
The review is here:
Katana Zero Review (Explicit Content)

Developer: Askiisoft
Publisher: Devolver Digital

Steam version that was reviewed: https://store.steampowered.com/app/46...

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