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.
Kill yourself in an elevator.
Most people go right. You went left.
Found all the hidden keys.
Found what the robber left behind.
Poor guy.
Why did you think it was a good idea to give him your Katana anyway?
Your trap card was activated.
Meet your final end in chinatown.
Achieve a total rank of gold or higher in a full speedrun.
Didn't wake up Leon.
You stopped a suicide. With a murder.
You ruined his fresh track suit.
Beat Katana ZERO.
Defeat the psychiatrist's final form.
You killed a suspiciously familiar character on the Quiet Hills set.
Fulfilled your secondary goal in the prison.
This will go well...
You really liked petting that cat.
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.
Jump off the balcony of the penthouse.
Complete a full run in hard mode.
Complete The Dragon's tape.