Hints are utilized by hitting
on the D-pad. As the achievement states, simply complete 6 of the Hidden Object puzzles without hitting
. This does not include the additional mini games - there's a separate achievement for those.
Just make sure you keep your hand away from the D-pad, as it's quite easy to accidentally use a hint. There's very little need for the D-pad, especially if you're following the walkthrough.
Hidden Object puzzles in this game feel even easier than the other titles from this developer. If you want to do this legitimately without the walkthrough, it shouldn't be too difficult.