(Unsure if you need V Extension Pack and if you need to play Dream It)
(As stated in the Xbox version of this achievement in this forum, it appeared to be glitched, and I am unable to verify if it is still the case for Xbox version)
Reach level 100
Go to Collection -> Music Video
Scroll down until you find a video called Dream It ~DJMAX RESPECT V Credit~
Play it until the end and when you return to the music video menu you will get it.
Enjoy!