How many animation clips do I need to create, if I'm creating a top down 2d game ?

Since my character will be moving by the means of the accelerometer, it will not be moving in only 8 directions (north,south,east,west,northeast,northwest,southeast,southwest). I’m really confused as to how many angles do I really need to create animations, because having them to transition between them will be crazy, as I’d have to calculate the angle of the movement and play a respective animation clip. Am I overthinking this ? Or is this a valid issue ?

Couldn’t you just create one animation and set the rotaion of the object to the tilt angle on the phone/tablet?