What are the accomplishments of the Song Dynasty?

There are several aspects:
The business: the trade was made to other countries by the sea routes; paper currency was issued to promote the business prosperous.
The agriculture, manufacturing industry and the transportation aspects: more tools and machines came into being and all of these boosted the industrialization.
Because of these material basis, the spiritual civilization developed fast in that time.
These are all I know and hope it can help you.