In short and simple terms, the phrase "to get the gold" means to achieve success, usually in a competition or goal, and be rewarded or recognized for it.
I also love that it has a zipper detail in the back — any shirt that has added interest in the back gets a gold star in my book! (finewineandtatertots.com)
That is what we are focused on getting the gold medal for. (itv.com)
The latter seems far easier than you'd expect, and I didn't actually find it that hard to get Gold on pretty much all the tracks I attempted. (alphr.com)