Visions of Mana

The money achievements are cumulative, so don't worry about spending your money throughout the game. I had 92k on hand when I got Saver (10G) for instance. There are probably 100+ side-quests in the game, most of which give 10k+ lucre. I don't think I even completed half of them and still had over 700k when I completed the story, so there's no shortage of money with honestly very little to spend it on, so this achievement won't be any conern or require any grinding.