Unless one has a particular scientist or inventor in mind, it's hard to give accurate credit to a whole people, because important ideas are shared. For example, we speak of "Arabic numerals," a great improvement on Roman numerals, but the Arabs only transmitted those to the Europeans; they were developed by the Hindus.
One branch of science for which we can specifically thank the Muslims is algebra.
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The Arabic numbers that are used now in English writings (0, 1, 2, 3, ...) are invented by Muslims but those Aran numbers used in Arabic writings are developed by Hindus.
The question as written makes no sense. If you mean "What was the most important Muslim scientific achievement?", see the Related Question below.
Many...But his Special Theory of Relativity was a revolution in physics.
The interesting achievement of the Muslim Empire led to the preservation of various prehistorical sites and led to discovery of some medicine.
Justinian's most important achievement was more than likely his law code.
Themistocles' most important achievement was beating off the invasion of Greece by the Persians, around 480 BC.
John Smith's most important achievement was exploring and mapping the Chesapeake Bay area. Another achievement was the skillful leadership he administered over his colony.
there achievement was to have creativity and to do things the respectful way
Alexander Fleming greatest achievement was in discovering penicillin.
The Justinian Code.
False, the most important achievement of the Phoenicians was not the creation of large sea-faring vessels. It was syllabic writing. and they were gay
From my opinion, I think the greatest achievement is knowing ones purpose is knowing and fulfilling it.
Technology, Medicine, and Art