Astronomy, Baghdad, Calligraphy, Chess, Art, Banking, Irrigation, Booking and Literature, Mathematics, Medicine, Pharmacies, Music, Polo, Scholarship and Learning, Libraries, and Zoology.
I think that booking and literature had the biggest impact on the modern world because the muslims were huge on writing and booking and building libraries. Also, muslims were known for paper making, which many of the islamic population did. Mostly all of the achievements above were influenced in some way by the greeks, romans, and persians. For example, the greeks were big on astronomy and the study of the skies, and the muslims closely studied the greek studies of astronomy.
The overall impact the crusades had was a lot of battle, violence, and a lot of having faith in religion. Many, many innocent lives were taken in the first crusade which represents a lot of violence. There were many battles that took place during the crusades so that obviously represents battle. The entire cause of the crusades was people wanting to take back the holy land for their religion, so that represents having faith in religion.