This is a poetic device. It does not mean that a specific number of sins had been committed, but it indicates that many sins had led to God's judgment. See how you translated these words in [Amos 1:3](../01/03.md).
Yahweh uses two negatives here to emphasize that he would punish them. See how you translated these words in [Amos 1:3](../01/03.md). (See: [[rc://en/ta/man/translate/figs-litotes]])
Here "Edom" represents the people of the country of Edom. Alternate translation: "the people of Edom" (See: [[rc://en/ta/man/translate/figs-metonymy]])