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