Source : Webster's Revised Unabridged Dictionary (1913)

Attainable \At*tain"a*ble\, a.
   1. Capable of being attained or reached by efforts of the
      mind or body; capable of being compassed or accomplished
      by efforts directed to the object.

            The highest pitch of perfection attainable in this
            life.                                 --Addison.

   2. Obtainable. [Obs.]

            General Howe would not permit the purchase of those
            articles [clothes and blankets] in Philadelphia, and
            they were not attainable in the country. --Marshall.

Source : WordNet®

attainable
     adj : capable of being attained or accomplished; "choose an
           attainable goal"; "art is not something that is
           come-at-able by dint of study" [syn: {come-at-able}, {gettable},
            {getable}]