Over the course of his career Archer earned many commendations, including the Medal of Valor, with clusters, the Star Cross, the Preantares Ribbon of Commendation, and the Federation Citation of Honor. For his service in the Romulan War he was promoted to the rank of Admiral, and by 2168, he had become Starfleet Chief of Staff. (ENT episode: "In a Mirror, Darkly")
In 2164 he was appointed an honorary member of the Andorian Imperial Guard by General Shran. On January 1, 2169, Archer retired from Starfleet, continuing his work as a diplomat by taking on the position of Federation Ambassador to Andoria. (ENT episode: "In a Mirror, Darkly"; ST - Destiny novel: Mere Mortals)
He served as Ambassador until 2175, when he was elected to the position of Federation Councillor from United Earth. He ascended to the presidency in 2185, serving two terms. (ENT episode: "In a Mirror, Darkly")
An additional screen of biographical information created by Mike Sussman for the ENT episode: "In a Mirror, Darkly" (seen here), but not used in the final production, revealed that Archer died in his home in New York in 2245, one day after attending the christening of the USS Enterprise.