Which Enzymes Catalyse the Deacetylation of Drugs in the Human Body?
Acetyl esters can be deacetylated by carboxylesterases. 

In case of an acyl/aryl group attached to acetate group (e.g., benzoate), I guess it will first undergo ring opening and then beta oxidation (as in case of tyrosine). 

Paracetamol -> p-aminophenol is a deamidation (I am not sure, but enzymes like ornithine decarboxylase can do that job... just a guess).