Filthy Rich

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Win a mission with at least 10,000 resources remaining.

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This is easier in the later chapters, but can also be easily done in the Grinder or Super Grinder game modes on any map they are available as they last so long you get a lot of resources over the course of the game. Practice mode also gives you so many resources that it makes this achievement a breeze.

To unlock the achievement you need to win a mission by having at least one core on the map after the last alien dies, and have 10,000 resources available. If you are close, you can sell unneeded towers and the resources from those will go towards the total needed for this achievement.