Everything can be on one circuit. It can NOT be on the bedroom circuit. It must be on its own separate 20 amp circuit.

Missed the part about the heaters. Yes they can all be on the same 240 volt circuit. A 20 amp 240 volt circuit is good for 4800 watts. You only have 2400 watts.

I believe a more detailed answer is that the bathroom receptacles must be either
a) on a circuit that feeds only loads in that bathroom or
b) on a circuit that feeds only bathroom receptacles, possibly in multiple bathrooms. But this is a poor choice because of the likelihood of simultaneous hair appliances tripping the breaker.

Lighting and fan can be on either the circuit referred to by (a) or on another circuit that feeds other rooms, but not (b).

The heater load will be subject to the 80% derating rule for continuous loads (sometimes stated as 125% ampacity required). So 4800*0.80 is 3840 watts maximum load. You have 2500 allocated here. You are ok but don't have as much margin as you might think.

Any bedroom circuit must be fed by the new Arc Fault Breakers.....

AFCI requirements vary by area. Some places have older codes that don't require them and some places have adopted newer codes and specifically excluded AFCIs. At any rate, an existing bedroom circuit that feeds loads in another room wouldn't have to be AFCI protected if additional outlets were added in the other rooms, absent a local rule.