Idle Champions of the Forgotten Realms

There are two ways to earn this achievement. First, you can play through the game until you get 100k gold, but this means sacrificing some progress since you won't be able to invest all of your gold into upgrades if you want to save it. Instead, I played for about 10 minutes, quit the game, and came back about eight hours later to have well over 100k gold.

This total is for all accumulated gold, so you are free to upgrade your heroes. If you are actively playing the game you should get it within your first hour or so