Lucky Nabaru, or lucky Grandfather Kumoni; the achievement says it all, you have to get really lucky. While playing as Grandfather Kumoni, when using the spinner to choose the 6th song you need to have 'item' appear next to 5, then land on 5. Persevere and try not to back out of a gig as it may block this achievement. There is a one in 150 song chance of getting this one as it is 1 in 25 chance of landing on 5 when the item is there, also you only get to use the spinner one in 6 songs. There is nothing really hard about the achievement, just keep completing songs to gain the opportunity to use the wheel. Ratings attained on songs, or XP earned will not effect the result of the spinner in any way.