** Shares of AF Legal Group rise 4% to A$0.13, set for best session since Oct. 1, if current gains hold
** Law firm announces conditional acquisition of Sydney-based Armstrong Legal's criminal and family law businesses, website for A$2.25 mln ($1.52 mln)
** Says acquisition to diversify co into criminal law
** Stock down ~32.5% YTD, including current session's moves
($1 = 1.4841 Australian dollars)
(Reporting by Nikita Maria Jino in Bengaluru)
((Nikita.Jino@thomsonreuters.com;))