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