Can I get citizenship and passport within 4 years, coming Argentina as a tourist. I'm a single man and currently I don't have intentions to get marry in Argentina..
how to start the process after coming to Argentina?
Maybe, but if you remain a tourist (without ever obtaining temporary residency) you will have to pay a lawyer specializing in citizenship for foreigners without a DNI thousands of dollars and there is no guarantee of success (or a refund if the "sentence" is unfavorable).