Catalyzes the formation of N(4)-acetylcytidine (ac(4)C) at the wobble position of tRNA(Met), by using acetyl-CoA as an acetyl donor and ATP (or GTP). acetyl-CoA + ATP + cytidine(34) in elongator tRNA(Met) + H2O = ADP + CoA + H(+) + N(4)-acetylcytidine(34) in elongator tRNA(Met) + phosphate Belongs to the RNA cytidine acetyltransferase family. TmcA subfamily.