A list of the icons is in the documentation of the
fontawesome5 packages; see their CTAN pages: academicons, fontawesome5.
If, OTOH, you're after a list of fields that
altacv supports, the best resource I've been able to find quickly is the document class file itself, on Github, which has
suggesting that you can use all those fields (
location). It also suggests a way of adding additional fields in case you happen to be on other platforms that are relevant for your CV.