Get Too Much Gold To carry Before or On Day 6.*
*Means you need to drop a coin before day 7,
but without pressing the coin drop button.
You can do this by being unlucky (a coin can bounce out of your gold pouch if it hits the side weird when it gets dropped in) or by bouncing off of other gold in your pouch (far more likely).
Fill Up That Gold Sack until The Achievement Pops!
There Are Usually Chests On Each Map, Some Contain Gold, Others Contain Jewels; So Exploration is Very Helpful!
Achievement did not pop Until Day 6, Even Though I had already done the aforementioned things.