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...
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.
Poor guy.
Beat Katana ZERO.
Kill yourself in an elevator.
Your trap card was activated.
Found all the hidden keys.
Didn't wake up Leon.
Complete The Dragon's tape.
Meet your final end in chinatown.
Found what the robber left behind.
You ruined his fresh track suit.
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?
Fulfilled your secondary goal in the prison.
Jump off the balcony of the penthouse.
You stopped a suicide. With a murder.
Most people go right. You went left.