Grease Dance
50 Achievements
PS3
One For the Yearbook
Have 20 photos taken of your performance (Dance Mode)
66.8%
How to unlock the One For the Yearbook achievement in Grease Dance - Definitive Guide
Beanpotter
TrueAchievements
TrueAchievements
This will pop up in no time. It will automatically take around 5/6 photos during each dance track so it should pop after you've performed 4 times.
leptonic
Story related. While you playing Dance mode, the game takes photos automatically across all the song, so after your 3-4 song, the game will take the 20th and you will see the trophy before the song ends.