many would say freeing the Jews from slavery which was important, but i lean toward being the mediator of the covenant between God and the Jews. That provided the line for the messiah, established many of the standards of morals we hold dear, and gave us the view of how God would interact with people who he claimed as his.
His greatest achievement was the delivering of the Torah from God (Exodus 24:12) to the Israelites (Deuteronomy 31:24).
His other accomplishments, including the Exodus, were secondary to the above.
Moses was an Israelite, a great-great grandson of Jacob. He was born 245 years after the death of Abraham. The time when Moses was born was when the Pharaoh had ordered his people to kill all Israelite male infants because he (Pharaoh) was afraid that the Israelites would become too strong for him (Exodus ch.1-2).
Moses' mother didn't want him to die. So she made a basket for him and put him in it to float in the Nile reeds. He was found by Pharaoh's daughter, who took pity on him (Exodus ch.2) and raised him as her own son. (See: How did Moses know he was an Israelite?)
Moses was forced to flee after killing a cruel Egyptian taskmaster, and went to Midian, where he wedded the daughter of Jethro.
He eventually achieved the highest level of prophecy (Deuteronomy ch.34) and was called upon by God (Exodus ch.3). He brought the Israelites out of Egyptian slavery (Exodus ch.12). He received the Torah from God (Exodus 24:12) and later recorded it in writing (Deuteronomy 31:24). He went up on Mount Sinai for 40 days and nights (Deuteronomy ch.9-10) and brought down the Two Stone Tablets with the Ten Commandments (Exodus 31:18). He brought the Israelites into the covenant with God (Exodus ch.19 and ch.24), and he oversaw the building of the Tabernacle (Exodus ch.35-40). He was the humblest of men and the greatest of prophets (Numbers ch.12).
See also:
Is Biblical-criticism reliable
On the biblical account, there are many achievements that could be regarded as Moses' greatest, including:
bringing upper and lower Egypt together to become one dynasty.
do you go to kimpton?
The Greatest achievement of the new stone age was farming.
The greatest achievement of the Inca empire was the building of Macchu Picchu.
The greatest prophet in Judaism was Moses.
Bobby Orr's greatest achievement ever was that he was a defenseman with an offensive mind.
his greatest achievement was that he was a pagal
The greatest achievement of any gay person is to live a happy, healthy life.
Abraham is not the main prophet of Judaism. Abraham was not regarded as a prophet. Judaism, unlike Christianity and Islam, does not have a main prophet. Moses is often considered the greatest prophet because of his achievement and his closeness to God. All prophets after Moses are said to have only glimpsed what Moses saw.
The greatest achievement of the Han Dynasty was the seismograph and the art of making paper.
Language is not humanity's greatest achievement because we did not invent it. We as humans could never do that.
His temple
your birth
electricity