Here is the full list of all 50 DJ Hero 2 trophies - there are 42 bronze, 5 silver, 2 gold and 1 platinum.
Collect all other Trophies.
Reach online grade 50.
In any Battle get an A for Scratching, a B for Taps, a B for Crossfading and an A for Freestyling.
Win 50 Online Battles (in any Online Battle mode).
Get a 400 streak in I Will Be Here / Speed Rail on Expert (in any mode except Party Play).
Play 5 mixes directly from Hero Feed Challenges.
Win 10 Checkpoint mixes (or single mix Battles) by a margin of 3 checkpoints or more (online only).
Play Streak and win 6 mixes (or single mix battles) by 20 streak margin (online only).
Play Accumulator and win 10 mixes (or single mix battles) with a streak of over 50 (online only).
Play a mix in Quickplay with another DJ and a Vocalist (in local play only).
Earn 5 stars for every mix at Expert difficulty (in Quickplay, Empire or Star Battle).
Perform Vocals in every mix that supports them (in any mode except Party Play).
Successfully perform 25,000 scratches (in any mode except Party Play).
Successfully perform 50,000 taps (in any mode except Party Play).
Win 5 Star Battles online.
Hit 100% of the vocal notes in a mix (in any mode except Party Play).
Get a 200 vocal streak in any vocal mix (in any mode except Party Play).
Earn 5 stars for any mix at all difficulty levels (in Quickplay, Empire or Star Battle).
Set up and save 3 setlists in Quickplay.
5 star Galvanize on Expert difficulty (in Quickplay, Empire or Star Battle).
Earn 12 stars in DJ Shadow's setlist in Empire mode on Expert difficulty.
Complete 30 Online Battles (in any Online Battle mode).
Play all of the DJ Battle mixes (online or offline).
Reach online grade 10.
Set up and play a 10 mix setlist in Quickplay, earning at least 4 stars for each mix.
Apply 'Like' tags to 10 mixes and play these mixes (in any game mode except Party Play).
Unlock all the Empire bonus mixes.
View the game credits.
Earn 12 stars in DJ Shadow's setlist in Empire mode on Hard difficulty or above.
Earn 12 stars in DJ Shadow's setlist in Empire mode on Medium difficulty or above.
Beat all the employee DJs in Checkpoint Battles in Empire mode.
Unlock all the Power Decks.
In Empire Mode beat DJ Qbert in each of his Battle Mixes.
Win all the DJ Battle setlists in Empire mode.
Successfully perform 20,000 crossfades (in any mode except Party Play).
Earn at least 3 stars in each of the mixes in the Tiësto Megamix (in Quickplay, Megamixes, Empire or Star Battle).
Activate 6 rewinds in Show Me Love (Stonebridge Radio Edit) / I'm Not Alone mix (in any mode except Party Play).
Win 10 Online Battles against players of a higher grade (in any Online Battle mode).
Win a Checkpoint Battle by knocking out the other player (online only).
Set your own online Tag and Medal.
Fail to 5 star Galvanize on Expert difficulty (in Quickplay, Empire or Star Battle).
Perform 4 720° rewinds in a single mix, on any difficulty level without dropping your multiplier (in any mode except Party Play).
Get an A for Freestyling in any mix (in any mode except Party Play).
Only crossfade to the left in all Freestyle sections in any mix (in any mode except Party Play).
Earn 33 stars (in Quickplay, Empire or Star Battle).
In Empire mode complete 3 Setlist Challenges.
Beat a friend's score on any of the leaderboards.
Play your opening night in Empire mode.
Calibrate your system for DJ Hero 2.
Complete 6 of the 'New To DJ Hero 2' Tutorial lessons.