As of February 12, 2020, the online servers have been shut down making a number of trophies, including the platinum, unobtainable.
Step 1: Complete the Tutorial
The tutorial will give you a basic rundown on how to play DJ Hero and utilize the turntable properly. You will be shown all the different type of scratches along with how to crossfade, use Effects Zones, Freestyle Sample Zones, Euphoria and Rewinds. Euphoria and Rewinds are key to achieving 5-stars. When you complete the tutorial, you will get Graduation.
Step 2: Watch the Credits
Let's just get this easy trophy out of the way! This will unlock Props!
Step 3: Start Playing Setlists
Start playing all the setlists using whatever difficulty you are used to. Ultimately, you want to have 5 stars on every song with Expert Difficulty. This will take a lot of practice and patience, but you can do it! The difficulty awards do stack, so if you 5 star all songs on hard, you will get the difficulty trophy for both medium and hard. Just by playing the setlists, you will unlock most of the trophies.
Step 4: Online Matches
You need to host and complete at least one online game. You have to join 3 separate games and complete a mix. You also need to win 10 separate games. See the trophy description below for more tips. Matchmaking may take a while and sometimes it will find no one. Use the boosting thread to find yourself a partner to trade wins with. See The New Style, Hello World, Win Online, Headliner, and Supporting Act.
As of February 12, 2020, the online servers have been shut down making these trophies unobtainable.
Step 5: Grab your Peripherals
You will need (1) a Guitar Hero or a Rock Band guitar, (2) another DJ Hero turntable, and (3) a microphone or headset to unlock three of the trophies.
See Double Trouble, Shout Out, The Power of Two and Guitar and DJ for details.
Step 6: Fix Up, Look Sharp (Clean Up)
Check the trophies you have missed and get those. Using quickplay an easy way to see how many stars you have on each difficulty for each song. Don't forget to check the Guitar Quickplay too! They separated the straight up DJ mixes and the DJ vs Guitar mixes. You need 5 stars with the Guitar songs as well (although you don't need a Guitar to get it).
Step 7: PLATINUM
*PING* Congrats! You're a DJ Hero!
As of February 12, 2020, the online servers have been shut down making this platinum unobtainable.
[PST Would Like To Thank Slamma for this Roadmap]