Voltage Regulation: Cascading vs. Individual
Some, especially if the current is relatively low, might be better served by cascaded linear or LDO linear regulators with a switching regulator. Cascading has a negative effect on efficiency typically (two 80% efficient regulators cascaded have only 64% efficiency) but usually it's overall efficiency and cost that matters. 

Maybe you can combine some- for example 1.80 and 1.85V. 

Another consideration is any sequencing that may be required- cascading could affect that by guaranteeing some voltages sequence in a desirable order, without the need for extra supervisory circuitry.