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