I've finished Tacoma recently on PlayStation and one of the available achievements is the "Catsitter". I could find the cat on E.V's office, medical and cryogenics. Where else can I find that cat?
According to this guide, there is a total of 7 different emplacements where you can spot the cat.
There are two in the personnel module, two more in the biomedical module, another two in the engineering module, and the last one is in the hub.
Here's the precise location for each one (taken from linked guide, to avoid potential deadlink later) :
During the main Crew Recording in Botany, follow Sareh into Food Storage and look in the room on the left for vats of meat products, and in a hole in the grating above you can spot the housecat.
During the main Crew Recording in Mechanical Engineering, head left from the main entrance into the Power Cell Room, and look up in the left corner above the cells to find the house cat asleep on top of some power cells.
Once you spot the first of Sareh' AR Crew Recordings, turn around from Sareh and look up towards the windowsills at the top of the main area with the stairs to find the housecat asleep near the windowsill at the highest point - opposite the newly opened door.
There is one sighting of the housecat in The Hub, only available at the end of the game.