This relates to the second part in a three-part challenge. To receive it, you'll first have to learn how to swim from Moneybags in Summer Forest.
From where you start the level, turn left and dive into the water. Head up a tunnel to a hidden room, and talk to the character to receive the challenge. Complete the first puzzle by jumping on each corner block clockwise or anti-clockwise, and then head back out into the starting area. Here you'll receive the puzzle which relates to the achievement.
You have to flame fish as they jump out of the water to feed an idol, feeding them ten to complete the challenge. However, they will only accept blue and yellow fish. Red fish will cause them to barf up some other fish. You need to avoid red fish entirely to get this achievement.
Luckily it's far easier in the remaster as you can now aim your camera over the edge, to see in advance what colour fish will surface next. If you accidentally flame a red fish, you'll have to quit out of the level and restart.
Here's a video showing the process.