To unlock the This Party Is Just Getting Started! trophy in Jump Force, you will need to use emotions 10 times.
At the main lobby, hold L1 and use the left stick to choose any of the available emotions. Keep pointing the left stick at the one you want and then release L1. Once the animation has finished, that will count as 1 use, so repeat the above steps nine more times.
Once you unlock the This Party Is Just Getting Started! trophy, repeat another 90 times for the Fanfare trophy.