Army of Ruin
221 Achievements
GOG
Coin Purse
Earn 500 Coins
44.2%
How to unlock the Coin Purse achievement in Army of Ruin - Definitive Guide
I'm not sure if this is cumulative or if it needs to be done in one stage, but you'll likely unlock this on your first or second stage regardless, and will routinely be getting more than this many coins each time you play a stage.