Theodore Carter Achilles, 80, a career Foreign Service officer and a former U.S. ambassador to Peru, died April 8 of an embolism at the Washington Hospital Center. He lived in Washington.

Mr. Achilles was a newspaper man in California and Japan before moving to Washington in 1931 and joining the Foreign Service. His first assignment was in Havana and he later served in Rome, London, Paris and Brussels.

While in London during the early part of World War II, Mr. Achilles was the U.S. representative to the free governments in exile of Poland, Belgium, the Netherlands and Norway. After the war, he held posts in the State Department's Office of Western European Affairs, of which he became director in the late 1940s.

In 1950, he became the U.S. vice deputy of the North Atlantic Council in London. He was the U.S. ambassador to Peru from 1954 to 1960. He returned to Washington in 1960 and became counselor of the State Department. He retired in 1962.

Since then, he had been a director and chairman of the board of the Atlantic Council of the United States, a nonprofit organization devoted to the development of Atlantic unity as a step toward greater world order.

Mr. Achilles was born in Rochester, N.Y., and graduated from Stanford University.

He had served on the boards of the Eastman Kodak Co. and the Federal Union of the International Management and Development Institute. He was a member of the Alibi, Metropolitan and Chevy Chase clubs.

Survivors include his wife, Marian Field Achilles of Washington; four children, Theodore Jr., of Seattle, Stephen and Daphne Achilles, both of New York City, and Ann S. O'Brien of Washington, and 10 grandchildren.