Deep Pockets
You must PICK UP 500,000 gold Cumulatively, this means when you kill monsters or loot chests and gold drops on the ground, then that will progress towards this achievement. The achievements in this game are buggy so to see your progress go into your challenges when your game is paused and look in General challenges. You will see a challenge that tells you to pick up 500,000 gold.
Compared to getting 5 million gold on Diablo 3 this is EXTREMELY simple and much faster. My first day of playing this game and spending the most of in in Act V I achieved 900k gold.
So the fastest way? Play Act V, you will find endless hordes of enemies and accumulate massive amounts of gold, the higher the difficulty, the more you will get, but don't go on a difficulty you cannot handle.
If you are a low level you won't get that much gold right away, also increasing the difficulty increases the amount of gold dropped. If you want you can put gear on that increases your gold find amount. For instance 2 really good pieces is the Goldwrap belt, and the Goldskin armor which both give a great amount of gold find increase, and then you can also put the highest emerald you have in your socketed helmet, that will increase your gold find also.
There is no way for another player to drop gold on the ground and you pick it up to unlock this achievement.
Since this is the amount of gold you pick up, missions and bounties don't count, the amount of enemies in rifts too is an extremely fast way to get a ton gold drops.
If you are a Demon hunter, gold picked up by your Ferret does not count towards this achievement.
Any Questions or Concerns? Comment or message me.