Here is the full list of all 13 Negligee: Opposites Attract achievements.
Reach the cute ending
Singing karaoke
Enjoying some food together
Sophie fouls your ball
Playing a game of pool with Sophie
Reach the disappointing end
Reach the wet ending
Watch Roxxie Perform
Enjoying a show with Sophie
Enjoying an ice cream
Going ice skating together
Be introduced to Sophie
Be introduced to Charlotte