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