There is an achievement to cast 20 distinct spells, but currently I see there are only 13 when I search this site. Are there only 13 at this time? Will there be more?
I was wondering the exact same thing…
There will be more spells in the future.
There are 14 right now. You probably don’t have the “Accio” yet, which is already in the game but not used in gameplay. Right now there is no way to get this achievement.