The Walking Vegetables: Radical Edition

You will need 15 RadRocks to unlock this trophy. They are dropped from bosses on Normal, in the Bonus Dimension, and you'll receive a bundle of them upon completing Too Hard Mode. They are the only item that carries over through each run. When you have 15, you will then need to locate a store. The levels are randomly generated so its location will vary. There is also a chance it will require a key to open, so just make sure you keep one on you just in case.

When you’re inside the store, you’ll see a load of purchasable items and a bar in the back. To the left of the bar is Smith Wesson. For 15 RadRocks, he will activate the Magnificent Monetization Machine and unlock the trophy. When it’s activated, you can drop any undesirable weapon(s) from your weapon wheel onto the platform in exchange for coins. Once he has unlocked the machine, it is open forever and can be used during every run from here on out except to Too Hard Mode - the machines all disappear for that.