Do all Orthodox saints have their own akathist? I don't quite understand the concept of an 'akathist' (hymn devoted to a saint). Are these written, one per saint whenever someone is glorified? Are they spontaneously generated over time? I am trying to find the akathist for St. Dorotheus of Gaza and do not know if he has one even.
Hopefully this blurb from this Wikipedia article answers your question:


  The writing of akathists (occasionally spelled acathist) continues
  today as part of the general composition of an akolouthia,
  particularly in the Slavic tradition, although not all are widely
  known nor translated beyond the original language. Reader Isaac E.
  Lambertsen has done a large amount of translation work, including many
  different akathists. Most of the newer akathists are pastiche, that
  is, a generic form imitating the original 6th-century akathist to the
  Theotokos into which a particular saint's name is inserted. In the
  Greek, Arabic, and Russian Old Rite traditions, the only akathist
  permitted in formal liturgical use is the original akathist.


In other words I gather that there may not be an Akathist for St. Dorotheus, or there may be one in Arabic that hasn't been translated.