Conversation so far:
Where did Massiaen grow up?
Olivier-Eugene-Prosper-Charles Messiaen was born December 10, 1908 in Avignon, France, into a literary family.
Who were his parents?
He was the elder of two sons of Cecile Sauvage, a poet, and Pierre Messiaen, a teacher of English who translated the plays of William Shakespeare into French.
How many siblings did he have?
CANNOTANSWER.
Where did he attend school?
At the Conservatoire, Messiaen made excellent academic progress.
In 1924, aged 15, he was awarded second prize in harmony.
What did he study?
After showing improvisational skills on the piano Messiaen studied organ with Marcel Dupre.
Who else did he study with?
After a year studying composition with Charles-Marie Widor, in autumn 1927 he entered the class of the newly appointed Paul Dukas.

Question: Did he have any significant acheivements during his youth?
Self-contained rewrite: Did Olivier Messiaen have any significant achievements during his youth?