My grandmother was from Croatia. My father remembers her repeatedly speaking the phrase "What goes around comes around" in the Croatian language. It is an idiom, so likely cannot be a word for word translation. It is a reference to kharma, and how if you do bad, bad things will happen to you. If you do good, good things will happen.
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As a Croatian, I believe I am familiar with a lot of the phrases people use here. I also believe my English is good enough to explain the phrase and some backstory to an English speaker.
I'm a native speaker and I can assure you that I will have no trouble at all finding the right idiom for that phrase! I could even provide a couple of relevant ones so that we may be sure you find the right one (: