Bachelet was born in Santiago to Alberto Bachelet Brandt and Mercedes Martínez Binimelis.
In 1940, in military service, he earned a scholarship to the School of Aviation Captain Manuel Avalos Prado, with Gustavo Leigh, by choice of the then commander of the Antiaircraft Artillery Regiment Hill, Colonel Luis Osvaldo Puccio Giesen. Leigh and Bachelet later were officers, one at Management Branch and the other at Branch of Air.
In 1962, under the presidency of Jorge Alessandri Rodríguez, Bachelet was appointed military attache to the Chilean Embassy in Washington D. C., USA. In 1972, Salvador Allende appointed him secretary of the National Supply and Marketing (DINAC), a position he had to turn the Boards of Supply and Prices (JAP) .
During 1973, General Bachelet was working in the Accounts of the Chilean Air Force (FACH). When he opposed the coup of 11 September, led by the commander in chief Augusto Pinochet and supported, among others, by his friend Gustavo Leigh, he was first arrested on the same day, 11 September 1973, in the office of the Ministry of Defence. Although he was released that night, his house was raided on 14 September and he was arrested again.
He was held at the Air War Academy of FACH, and its principal then Colonel Fernando Matthei. In this place Bachelet was subjected to interrogation and torture by his own comrades in arms. Then he was transferred to the FACH Hospital. In a letter to his son Albert, who lived in Australia, he reported:
I broke inside, at one point, I walked bursting morally – never knew hate anyone, I always thought that the human being is the most marvelous of this creation and should be respected as such, but I found comrades FACH I've known for 20 years, my students, who treated me like a criminal or a dog.
He was put under house arrest in October 1973, but on 18 December he was arrested for the third time with several officers and NCOs in the Air Force, who tried for "treason" in Martial entitled Aviation / Bachelet and other ROL 1-73, also known as FACH Process.
He died on 13 March 1974, after suffering a heart attack in jail in Santiago, where he was being questioned by his own colleagues in the FACH.
He was married to archaeologist Ángela Jeria Gómez, with whom he fathered two children, Alberto and Michelle. Michelle later became the first female president of Chile.