Here is the full list of all 22 Katana ZERO achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Achieve a total rank of gold or higher in a full speedrun.
Defeat the psychiatrist's final form.
Complete a full run in hard mode.
Found all the hidden keys.
Didn't wake up Leon.
Found what the robber left behind.
Fulfilled your secondary goal in the prison.
You stopped a suicide. With a murder.
Kill yourself in an elevator.
Your trap card was activated.
You ruined his fresh track suit.
Poor guy.
You killed a suspiciously familiar character on the Quiet Hills set.
Why did you think it was a good idea to give him your Katana anyway?
Jump off the balcony of the penthouse.
You really liked petting that cat.
Most people go right. You went left.
In 1962, the Orlons released one of the all-time greatest doo wop hits, Don't Hang Up. Google it. Anyway, you hung up your phone a lot.
Beat Katana ZERO.
Complete The Dragon's tape.
Meet your final end in chinatown.
This will go well...