The gold conquest is best done on TX, with a level 50 boon, gold gear on (goldskin, goldwrap, avarice band).
To get the sequence of 50M+, it's best to run through the map and spawn all of the critters. The trick is that they only spawn when you track over certain parts of the map; you'll learn them after a few tries if you don't know them already (there are a lot; in every little nook and cranny). After you go through and spawn everything (try to kill as little as possible), go back through and collect 400M gold.
I managed to get the counter up to 65M before I said that was enough.
FYI: boon doesn't work unless
you get the killing blow, so doing this in a group is a no-go unless others are simply there to spawn and gather for you and not kill anything.