This requires you to build up a 48x (!) multiplier to get.
Most easily acquired with the first quest from Maximilian, over in the east side of the first area. Aggressively gather up the multiplier coins, and go through the back yards of the people's houses to get the last few rather than going along the street. Most easily done with a fresh map with all the people/objects/structures intact to help maintain the multiplier.
Note that your multiplier meter starts diminishing *rapidly* after you cross 40, so you're going to have to be quick about getting those last few coins.