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