Shortly after his arrival, the young artist got in contact with Tintin magazine, for which he drew some illustrations, and decided to devote himself to comics.

In the 1950s, he published Criche e Croc in the Italian magazine Il Giornalino and Fanfan et Polo in La Libre Belgique with scripts by Jean-Michel Charlier and then René Goscinny.

At that time, he also worked for Spirou magazine with some contributions to Les Belles Histoires de l'Oncle Paul.

After his departure from Tintin in 1968, Attanasio started working for the Dutch market, creating the series Johnny Goodbye with Martin Lodewijk and Patty Klein for Eppo and Pep, with Bandoneon (with Delporte) in Pep and with De Macaroni's (with Dick Matena), but also for Italian magazines with "Ambroise et Gino" in Corriere dei piccoli.

In 1991 Attanasio created a comic adaptation of Boccaccio's literary classic Decameron with his son, published by Lefrancq.