In my country, although English is not our native language, it is spoken quite a lot. I've heard many a time only being used for emphasis,but I don't think I've ever seen a native using it. Here is an example
You are going there only.
I heard someone using this sentence when they wanted to get something and asked someone to bring it. When that someone refused, they said "You are going there only, what's the problem in bringing it?"
Is this kind of usage acceptable?
The question is, "acceptable" to whom? There is no "Academy of the English Language", like there is with French, that makes the rules of what is proper English and what is not. If that is how only is used in the dialect of English that people speak in your country, then that is how that dialect is.
That said, only is not used exactly that way in American English (or, I think, in most other dialects), and using only that way is a very strong indicator of speaking Indian English. In American English, we do use only for a kind of emphasis, like
The Disney organization defines a ticket as admission for one day only
but there is still the sense of exclusion, like "one day, but not more than one day."
