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