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.
You really liked petting that cat.
Found all the hidden keys.
Found what the robber left behind.
Defeat the psychiatrist's final form.
Kill yourself in an elevator.
Your trap card was activated.
Didn't wake up Leon.
Meet your final end in chinatown.
You ruined his fresh track suit.
Poor guy.
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?
This will go well...
You stopped a suicide. With a murder.
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.
Fulfilled your secondary goal in the prison.
Jump off the balcony of the penthouse.
Most people go right. You went left.