Hi! This is my first time creating a guide, so I am still learning the formatting. For this achievement, you have to have your camera on the ninja duck, and when he disappears you need to find him in different locations in order to get this achievement to register. I found the ninja duck a total of 9 times: 8 at Infinity Cool (3 in same location), and once in the Lodge. I am not documenting the Lodge because the other guide writers had photos for the Lodge, but not the Infinity Cool, which is why I wanted to document with screenshots the Infinity Cool locations. I know I had seen comments from other users about an Infinity Cool location where the ninja duck hid behind bushes in the top right by the deck chair, but I did not catch him there any of the times myself personally. The achievement registered for me after I found him in one Lodge location and then 6 Infinity Cool locations, with one Infinity Cool location being used approximately 3 times (the one between the bush and palm tree was his most popular spot). Also, some commenters mentioned naming the duck to better spot him, so in my screenshots as you can see, he is named One Ninja Boi. I hope this guide helps those who are working on this achievement!