\documentclass{article}

\usepackage[acronym]{glossaries}
\setacronymstyle{long-short}

\makeglossaries

\newacronym{acr1}{acr1}{first acronym}
\newacronym{acr2}{acr2}{another version of \gls{acr1}}

\begin{document}

\printglossaries

In my text, I first use \gls{acr1} and \gls{acr2} for the first time, then I
use both \gls{acr1} and \gls{acr2} a second time.

\end{document}
