Thanks to @Defested (His comment bellow), if you want to start the hunt you have to put 4 items (One mele and range weapon, artifact and gear/armor) with specific combination of the little symbols on each item. As I tried today, they have to be at least 3 diffrent symbols. If I know more, I will add it to this guide
In order to get this achievement you have to collect 500 gold in acient hunt missions.
You can do it in the new cave down stairs in player's camp, it requires to give items which total items power must be at least 100 (an example a sword 73 power and armor 27 power). Then choose the difficulty you want and play the hunt!
During hunt you will find many new chests which gives you the gold after you open them (about 5-8) also you can get the gold from mobs but for now I don't know exactly which do it, I think it's random, and then do it a few times, after one run I collected 50 so it is goona be about 8-10 rushes.
If you have any questions ask me bellow, I will try to help :)