How would you do it?

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Oh I know! There should be achievements for let's say, mining 50 diamonds. You would get the achiecement, What's this shining rock?. So, the fact that you get a reward for it, makes it funner. Also, Tig has a good idea. But if you could please reply, what kind of minigames? And for the achievement that I noted previously, you would get the reward of 700 gold.