|Save up 15,000 coins without spending it|
This is a pretty straight forward achievement. You need to have 15,000 coins on your person at any given time. My advice would be not to worry about hording coins early on, as you will need to spend them on upgrades in the shop to make yourself powerful enough to deal with the waves. This can easily be gotten during wave 40-50, as completing those waves should net you around 4K coins. Simply save up a few waves then, as you should be pretty strong by then, and then you will net this achievement.
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