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