He moved from the bank to become principal assistant secretary at the Ghana Ministry of Finance.
In 1971 he was seconded from the ministry to the International Monetary Fund in Washington, D.C., as a senior economist, returning to Ghana and the Ministry of Finance as senior principal secretary in 1973.
Following his time at the bank, he was appointed director of the Commodities Division of the United Nations Conference on Trade and Development (UNCTAD) in Geneva.
He held that position until he retired in 1994 and returned to Ghana, where he led the World Bank's Financial Sector Adjustment Program until 2000.
Ashiagbor continued to serve his country well into his retirement and in 2006, was awarded the Order of the Star of Ghana in recognition of his contributions to the nation.