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