The Muslims invented/discovered the concept of zero.
The interesting achievement of the Muslim Empire led to the preservation of various prehistorical sites and led to discovery of some medicine.
The question as written makes no sense. If you mean "What was the most important Muslim scientific achievement?", see the Related Question below.
I think that the greatest achievement was art, science and technology.
When it was first formed in 1918, it was the first democratic and secular country in the Muslim world. Also, in the early 1900s, it produced the majority of the world's oil, and is still a big oil producer.
A very big one is medicine
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World Muslim Congress was created in 1949.
The ISBN of Engaging the Muslim World is 0230607543.
Muslim World League was created in 1962.
Early Muslim mathematicians made critical advances in algebra, geometry and trigometry, which lead in turn to the mathematics of calculus. See relate links.