Arrested by the British because off his political activities, he discovered his talent as a sculptor while carving bas-reliefs on the walls of his jail cell.

In 1947 he was invited to Prague where he won the Grand Prix in the competition for the rebuilding of the martyred town of Lidice in the Czech Republic.

There he met other renowned artists of the time including Salvador Dalí, Zadkine (with whom he had many disputes) Pablo Picasso and Brâncuși whose simplified forms he admired.

He regularly took part in many exhibitions (such as La Jeune Sculpture, Comparaisons and Le Salon d’Automne), winning recognitions such as the Grand Prix des Beaux-Arts de Paris in 1965.

In 2003 an Achiam Museum, displaying over a hundred of his works was created in the thermal baths of the Roman amphitheatre of Shuni in Binyamina in Israel (Jabotinsky Park).

Another major source of his inspiration comes from the Bible, from its heroes, prophets and kings, whose essential characteristics he represents while rejecting anecdote in order to express their universal meaning.

A museum is dedicated to Achiam in Israel in the old Roman thermal baths of Shuni (Jabotinsky Park) in Binyamina near Caesarea.

Other institutions, like Gratz College in Philadelphia (USA), the Esterhazy Museum in Eisenstadt (Austria), and the Caisse des dépôts et consignations also possess some works of Achiam.