Reza Shah's major achievements included:
Successful suppression of separatist movements and reunification of Iran under a powerful central government.
Foundation of the first judicial system of Iran.
Foundation of the first health care system and public hospitals across the country.
Eradication of epedemic diseases such as malaria.
Reestablishment of Iranian Gendarmerie and Shahrbani in order to enforce the law, limit civil disorder and protect property.
Foundation of Trans-Iranian Railway which connected Caspian Sea to Persian Gulf.
Nationalizing Iranian forests and jungles.
Creation of the modern-day Iranian Army (Iranian Air Force, Iranian Navy, Iranian Ground Forces).
Creation of the first Iranian radio.
Creation of national Museum of Iran.
Rebuilding Iran's historical sites including Tomb of Ferdowsi and Tomb of Hafez.
Organizing the Ferdowsi Millenary Celebrations to commemorate the thousandth anniversy of Ferdowsi's birth as the savior of Persian language and Iranian identity.
Creation of Iran's Academy of Persian Language and Literature in order to protect Iran's official language.
Building many roads, tunnels and bridges all over the country such as Kandovan road, Pahlavi Street, Kandovan tunnel and Veresk bridge.
The first scientific excavations at Persepolis, the ancient capital of the Achaemenid Empire, were carried out by the initiative of Reza Shah. Ernst Herzfeld and Erich Schmidt representing the Oriental Institute of the University of Chicago conducted excavations for eight seasons, beginning in 1930, and included other nearby sites.
Creation of the Iran's first national bank known as Bank Melli Iran and other Iranian banks such as Bank Sepah and Keshavarzi Bank.
Creation of the first university in Iran which is known as University of Tehran.
Transferring and providing full scholarships for the Iranian students to European countries for studying abroad.
Eradication of corruption in civil servants, paying wages in time so people did not have to rely on bribes.
Creation of the first national school system and schoolbooks in Iran; before Reza Shah Pahlavi, the Islamic madreseh and Quran was the only form of schooling available.
Establishment of the first Iranian kindergarten and school for deaf people.
Creation of the Iran Scout Organization.
Creation of birth certificates and Identification cards for all Iranians.
Creation of the first Iranian airplane factory with buying license from Germany.
Builiding the first Iranian airport known as Mehrabad airport.
Changing Iranian currency from Toman to Rial.
Restoring Persian calendar and making it the official calendar of Iran.
Kashf-e hijab (Unveiling). On 8 January 1936, Reza Shah issued a decree banning all veils (headscarf and chador), an edict that was swiftly and forcefully implemented. The government also banned many types of male traditional clothing.
In the Western world, Persia (or one of its cognates) was historically the common name for Iran. In 1935, Reza Shah asked foreign delegates to use the term Iran, the historical name of the country, used by its native people, in formal correspondence.https://en.wikipedia.org/wiki/Reza_Shah#Legacy