Here is the full list of all 18 OTXO achievements.
Kill 15 enemies with doors without dying
Go fishing
Play fetch
Kill 50 enemies with grenades
Vault over 50 times
Order the ANIMAL drink at the bar
Kill 50 enemies with kunai
Die for the first time
Clear a room without using Focus
Roll over 100 times
Kill an enemy with a thrown magazine
Collect all guns
Collect everything from the gachapon machines
Clear a room by only kicking
Destroy the Heart
Clear a run on Impossible Mode
Unlock all drinks
Clear a full run without taking any drinks