This is an attempt, hoping it will serve as a starting point. For more detail, please refer to its manual PgfGantt. inline=false
means to write the label on the left edge.

Code
\documentclass[border=10pt]{standalone}%{article}
%\usepackage[margin=1cm]{geometry}
\usepackage{pgfgantt}
\usepackage{graphicx}
\usepackage{xcolor}
%\usetikzlibrary{positioning}
\ganttset{group/.append style={orange},
milestone/.append style={red},
progress label node anchor/.append style={text=red}}
\begin{document}
% \begin{figure}
% \centering
\begin{ganttchart}[%Specs
y unit title=0.5cm,
y unit chart=0.7cm,
vgrid,hgrid,
title height=1,
% title/.style={fill=none},
title label font=\bfseries\footnotesize,
bar/.style={fill=blue},
bar height=0.7,
% progress label text={},
group right shift=0,
group top shift=0.7,
group height=.3,
group peaks width={0.2},
inline]{1}{24}
%labels
\gantttitle{A two-years project}{24}\\ % title 1
\gantttitle[]{2013}{12} % title 2
\gantttitle[]{2014}{12} \\
\gantttitle{Q1}{3} % title 3
\gantttitle{Q2}{3}
\gantttitle{Q3}{3}
\gantttitle{Q4}{3}
\gantttitle{Q1}{3}
\gantttitle{Q2}{3}
\gantttitle{Q3}{3}
\gantttitle{Q4}{3}\\
% Setting group if any
\ganttgroup[inline=false]{Group 1}{1}{5}\\
\ganttbar[progress=10,inline=false]{Planning}{1}{4}\\
\ganttmilestone[inline=false]{Milestone 1}{9} \\
\ganttgroup[inline=false]{Group 2}{6}{12} \\
\ganttbar[progress=2,inline=false]{test1}{10}{19} \\
\ganttmilestone[inline=false]{Milestone 2}{17} \\
\ganttbar[progress=5,inline=false]{test2}{11}{20} \\
\ganttmilestone[inline=false]{Milestone 3}{22} \\
\ganttgroup[inline=false]{Group 3}{13}{24} \\
\ganttbar[progress=90,inline=false]{Task A}{13}{15} \\
\ganttbar[progress=50,inline=false, bar progress label node/.append style={below left= 10pt and 7pt}]{Task B}{13}{24} \\ \\
\ganttbar[progress=30,inline=false]{Task C}{15}{16}\\
\ganttbar[progress=70,inline=false]{Task D}{18}{20} \\
\end{ganttchart}
% \caption{Gantt diagram for 2013--2014 Project}
%\end{figure}
\end{document}