This is a Secret Achievement.
It is much easier to obtain this achievement if the player has the Coin Magnet gadget equipped. In addition to that if they have the Insta-Ball gadget equipped because it will bounce them three times while dead leading to further distances. Another suggestion is to use a Final Blast when the player is near a group of coins to collect them.
It is not necessary to collect all 20 coins in the same run; normally, this achievement is easily unlocked with minimal effort.
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