\documentclass[a4paper]{article}

\usepackage{pgfplots}

\begin{document}

\begin{tikzpicture}
	\begin{axis}[clip=false]
	\addplot+[only marks] coordinates {(0,0) (1,1) (2,2) (3,3)} 
		node[pos=0,   pin=45 :0   ] {}
		node[pos=0.1, pin=90 :0.1 ] {}
		node[pos=0.2, pin=200:0.2 ] {}
		node[pos=0.3, pin=135:0.3 ] {}
		node[pos=0.4, pin=0  :0.4 ] {}
		node[pos=0.5, pin=60 :0.5 ] {}
		node[pos=0.75,pin=180:0.75] {}
		node[pos=1,pin=45:1] {}
	;
	\end{axis}
\end{tikzpicture}
\end{document}

