Thanks to https://tex.stackexchange.com/a/253466/188437 and to the manual of the acro package (https://mirror.informatik.hs-fulda.de/tex-archive/macros/latex/contrib/acro/acro_en.pdf) I was able to get the following list of abbreviations:
However I have to add a description of the columns above each column, like this:

Means I would like to add "Abkürzung" and "Erläuterung" in bold and above the other entries. Does anyone know how to achieve that? Thanks a lot in advance!
\documentclass[12pt]{report}
\usepackage{acro}
\usepackage{enumitem}
\newlength\myitemwidth
\setlength\myitemwidth{5em}
\newlist{listabbrev}{description}{1}
\setlist[listabbrev]{
labelindent = 0pt,
labelsep = 0pt,
leftmargin = \myitemwidth,
labelwidth = \myitemwidth,
format = \normalfont
}
\DeclareAcroListStyle{styleabbrev}{list}{list = listabbrev}
\acsetup{list-style = styleabbrev,
list-heading = chapter*,
list-name = Abkürzungen
}
\DeclareAcronym{EEG}{
short = EEG,
long = Erneuerbare-Energien-Gesetz,
}
\DeclareAcronym{dbms}{
short = DBMS,
long = Database Management System,
}
\begin{document}
\printacronyms
\acuseall
\end{document}


\acsetup{}for one part? So that I can define\acsetup{}twice but differently each time? One for "Abkürzung" and "Erläuterung" in bold, and one for everything in normal font. Unfortunately and for whatever reasonshort-format =andlong-format =inDeclareAcronym{}don't work in my document. – TeXlearner Jun 05 '19 at 09:49\DeclareAcronym{0000}{ short = , long = , }- maybe there is a way to overwrite this line by layering the wanted text above? I will do research on that later, but if anyone has an idea, please say so! – TeXlearner Jun 06 '19 at 12:49\normalfontin\setlist{}and got the bold font in the first entry by this:\DeclareAcronym{00000Header}{ % \ac{00000Header} short = \textbf{Abkürzung}, long = \textbf{Erläuterung}, }. Now even the sorting function is still working. Thanks a lot for the help! :-) – TeXlearner Jun 10 '19 at 12:19