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.
Kill yourself in an elevator.
Your trap card was activated.
This will go well...
Poor guy.
Jump off the balcony of the penthouse.
Why did you think it was a good idea to give him your Katana anyway?
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.
Complete a full run in hard mode.
You really liked petting that cat.
Found all the hidden keys.
Found what the robber left behind.
Didn't wake up Leon.
You stopped a suicide. With a murder.
Most people go right. You went left.
Achieve a total rank of gold or higher in a full speedrun.
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.