This achievement sucks. Most people (as with 2K13/14) will end up buying "VC" from the store to earn this achievement.
The cheapest "Booster" is only 2250 "VC".
Well 2250 times 15 is equal to 33750 "VC".
I would recommend that you buy the 50K "VC" pack for $9.99 from the store because it will also unlock "Runneth Over" (30) "Obtain a balance of 20,000 VC."
With the 50,000 VC, I was able to buy 15 boosters, and have enough money left over to buy 5 "Signature Skills" <--- (For another achievement), and I was able to buy the "Jordan Dunk Package" <--- (For another achievement, requires 80 Dunk, in MyPlayer, which I was able to boost up using the VC I had left over)
If you downvote this, PLEASE explain why, so I can edit/enhance the guide.
EDIT:
Some information added via j00na5
"I don't know if this is permanent or not, but these are the only boosters that are available at the moment:
Bronze Historic 3,250 VC
Silver Booster 5,000 VC
Silver Historic 5,250 VC
Gold Historic 10,500 VC
So now it will cost 48,750 VC to get the achievement."