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Get a Journalism Score of 100%.

This description is misleading - basically it means you have to 100% the single player part of the game. Meaning, you need to complete all single player trials (which includes killing 250,000 zombies), and unlock all skills. The latter requires finding all the single player training manuals, and getting to level 100.

Single player training manuals can be found at:

Mall
Evasion - In Homerunners, on the 2nd floor of the hallway between Caribbean Cove & Kiichiro Plaza
Skill Move Efficiency - In the safe house, available to buy once it reaches level 3.
Old Town
Final Blow - In Tetro's Comics & Collectibles
Precision Targeting - In the safe house, available to buy once it reaches level 3.
West Ridge
Food +2 - In the safe house, available to buy once it reaches level 4.
Inventory Slots+ - In the safe house, on the 2nd floor
North Peak
Elemental Critical Hits - In Freebirds Gun Shack & Shooting Range
Inspiring Presence - In the safe house, available to buy once it reaches level 4
For more info on the trials, see: "Story Completionist."