DJ Hero
50 Achievements
1,000
80-100h
Headliner
Host and complete an online game.
5
How to unlock the Headliner achievement in DJ Hero - Definitive Guide
I recommend creating a custom setlist as well, so that you can earn the "The New Style" Achievement at the same time. Create a custom setlist with only one track to cut down on the time required to unlock the Achievement.
UNOBTAINABLE, DUE TO SERVER CLOSURE
This trophy is really easy but if you have a slow connection you may have problems. I did have problems with my connection but I did this trophy in the house of a friend with a faster connection.
You will have to go to the second option at the left of the menu and then click on "Create Match", then you must choose a setlist, being quickplay the one that people most decide to play. If you have problems with that change the difficulty level and maybe other people will be playing in that level. Alternatively you can invite a friend by clicking in "Create Private match".
You do not need to win these matches but if you do it will count towards the "Win Online" trophy.
You can use the boosting threadhere if you really can't find anyone.