Final answer:
Catherine the Great, ruler of Russia, had major accomplishments including expanding the Russian empire, implementing reforms, and increasing Russia's power in Europe.
Step-by-step explanation:
Catherine II, also known as Catherine the Great, had several major accomplishments as the ruler of Russia. One of her key achievements was her expansion of the Russian empire, which included acquiring new territories and increasing Russia's influence. She also implemented several reforms, such as modernizing the legal system, promoting education and the arts, and improving the conditions of the serfs. Additionally, Catherine the Great played a significant role in expanding Russia's power in Europe and establishing it as a major world power.