Talking to the media in Hyderabad, Reddy also thanked Congress president Sonia Gandhi as it was the former United Progressive Alliance (UPA) regime, which granted statehood to Telangana in 2014.
"Sacrifices of our youth and KCR's fast-unto-death forced the UPA government to grant statehood to Telangana. We achieved our just demand," he said, adding the formation of Telangana accelerated development in Andhra Pradesh.
Rao had begun his indefinite fast on November 29, 2009.
The chief minister's daughter and Member of Parliament K. Kavitha were among those present in the function held at Telangana Bhawan in the national capital.
"It was today when unrelenting pursuit of A FIGHTER turned into a revolution leading to SeperateStatehood #DeekshaDiwas #JaiKCR #JaiTelangana," she tweeted earlier.