Abolition of serfdom
He was the First Secratary of Treasury
He is considered to be the inventor of the telephone.
Becauese of his great military achievement of defeating and taking over the Persian Empire.
tat he frated
Alexander Fleming's most important achievement was the discovery of penicillin in 1928. This discovery revolutionized the field of medicine by introducing the first antibiotic, which significantly reduced mortality rates from bacterial infections. Fleming's work laid the foundation for the development of many other life-saving antibiotics.
Alexander L. Norrie has written: 'Communication of geometrical structure and its relationship to student mathematical achievement'
he invented the telephone, a immense achievement in those days
The most lasting achievement of Alexander the Great was the spread of Koine Greek throughout the Mediterranean world and the Middle East. A common language became spoken from Spain to India.
He inventined the telephone he opened a school of vocal physiology and mechanics.
He wrote The Count of Monte Christo along with many other books.
Alexander the Greats greatest achievement was spreading Greek civilization and the pillars of Hellenism through the lands he conquered. Because of this the language of the world has been enriched and countries have been founded and developed on the principles of ethics, democracy and freedom for all.
I presume you mean Tsar Alexander II of the Russian Empire. He did many things, of course, but his main achievement was the emancipation, at LONG last, of the millions of Russian serfs.