1. The achievement track only updated when you deposit gold in your bank
2. This is no longer possible due to the account wallet update removing the option to deposit gold in the bank
3. The (first) description changed to “Have 2,000,000 gold in your inventory at one time”, but the functionality hasn’t actually changed to match. The (second) description still says “Most coins banked” and lists the most coins you had banked before the update.
Source: I’m sitting on 153g since the cash I had on each of my characters is now part of one lump sum with what was in my bank, but the title still displays roughly 115g