\chapter{\acronymslisttitle}

%% Standard description block from LaTeX
%% leftmargin and labelwidth are provided by enumitem pkg
%% \widthof command provided by the calc pkg
\begin{description}[leftmargin=!,labelwidth=\widthof{\bfseries Your longest label}]
\item[B.A.A.] Baccalauréat en administration des affaires
\item[M.Sc.] Maîtrise ès sciences
\item[Ph.D.] Philosophiae Doctor
\item[Your longest label] Description of your longest label
\end{description}
