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Collect all Boatman Coins.

The achievement description here is a little misleading. You actually only need to collect 350 coins for the in-game "Mint III" quest for this achievement and there are well over 400 total coins to collect in the game. As you go through each level, you should find a map on a pedestal which will then display every collectible in the level. The green icons are the Boatman coins. Most of these are very easy to collect, though a few will require abilities that are unlocked in later levels. Don't worry too much about collecting every coin your first time through. If it looks like you can't reach it for one reason or another, move on and try again on your Apocalyptic playthrough. Be sure to also pay attention to the side-quests available, as these reward coins too.