Don't Need It
Drop 20 Money Pouches in the streets.

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Before you can drop money bombs, you need to have first completed Sequence 2. Now go into the skills menu, then the "Ranged" section. There is a skill for money bombs here, and you need to buy it before you can use money bombs. Once you have bought the skill, you can "buy" money bombs from merchants. This game isn't like past assassin's Creed games where you could just throw money on the floor and it came out of your total cash, you need to actually buy them this time. Simply throw 20 of these on the floor and the trophy will unlock. If you don't want to waste money on these bombs, you can always use them up in a mission, then reload checkpoint or kill yourself. That way you will spawn with the same amount you had, and the ones you threw down before will still have counted towards the total.