Besides official documentation I have found only this post. But it is quite old and incomplete (only -XX options available).
For example, I couldn't find -XX:AutoBoxCacheMax option in none of them.
Where the complete list can be found if it exists?
You can use
java -XX:+UnlockDiagnosticVMOptions -XX:+PrintFlagsFinal -version
to print all options and their defaults. If you have a debug build you can use this command to print comments for the various options as well:
java -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+PrintFlagsFinal -XX:+PrintFlagsWithComments -version
PS: There are descriptions for most of them in this blog post: http://stas-blogspot.blogspot.bg/2011/07/most-complete-list-of-xx-options-for.html