The best you'll get is the 'qpkg' program. Running "qpkg" by itself is supposed to return "installed packages", but it appears to list everything in the portage database. Packages you have installed are marked with an "*". Problem is, my limited knowledge of 'grep' doesn't allow me to filter those items marked that way...
Maybe you should try -I option ?
#qpkg --help
(...) In section Package Selection: -I, --installed Include only installed packages (...)
-- Jiim
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