\documentclass{memoir}
\usepackage[toc,nomain,acronym,nopostdot,nonumberlist]{glossaries}
\makeglossaries
\newacronym{ACK}{ACK}{acknowledge}
\begin{document}
\pagestyle{ruled}
%\renewcommand{\glossarymark}[1]{%
%      \markboth{\memUChead{#1}}{\memUChead{#1}}%
%}
\glsaddall
\printglossary[title={Acronyms and Abbreviations},type=\acronymtype]
\end{document}