Which major accomplishment were achieved within the persian empire

Some of the major accomplishment that were achieved within the Persian empire are:

- their legal system - strict, but very sophisticated for their time, outshone only by those of Greece and Rome, the classical examples of ancient civilization

- sophistication of their arts - the Hanging Gardens of Babylon would be among the Persians' top achievements.

new evidence is discovered.

oversights and errors are corrected,

new technology is applied to evidence.

in his book, the riddle of the rosetta stone, james giblin talks about how there was a young british polymath and physician named thomas young who made a lot of advances on the deciphering of the rosetta stone. he says that even though young made a lot of mistakes because he was working under false assumptions, he also made huge contributions like deciphering three out of the seven symbols (more than anyone else before him). young published his findings and continued his good work but he wasn't able to progress much further due to some unfavorable situations, he still laid the basis for many other scholars and of course for the man who has been generally known to have deciphered it, jean-françois champollion