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Love the concept, it's really nice! I'm still at the beginning of the game, but is there any indication of how much each gem increases the production?
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Is there any way for us to trade faction coins? As once you join a faction, you really do not have use for the other faction coins?
Royal Exchanges are what you are looking for. Starting at 20 coins, you can buy a royal exchange (i.e. Fairy Exchange, Elven Exchange, etc) which will increase your overall production by 10%. The cost of each Royal Exchange increases progressively with each purchase.
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[Suggestion]: Include in the text for the achievements a progress bar of some kind.
[Suggestion] A good way to get by without a tutorial when in early development is to have a text box show information about something your mouse is over. Maybe I wish to know what the different coins are used for at the early stages of the game.
Otherwise a great start!
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{Suggestion} Change the spell trophies to "total mana used" instead of total spells used because otherwise the easiest way to win the trophy is to spam tax collection 5000 times lol.