Earlier, a Phantom Initiate assignment was added to Battlelog for Battlefield 4. It may have taken the better part of a month but people have finally discovered the necessary password in order to unlock it so that you can start trying to earn it.

The password is: 24344241893

If you need a refresher on how to access the area to even put the code in, just follow these steps:
Prerequisites:
  • You must have Battlefield 4 Premium.

Steps to unlock:
  1. Go to Battlelog and log in
  2. Click on Leaderboards
  3. Scroll to the bottom of the Leaderboards page
  4. At the bottom left of the page is a small, faded skull icon (See Screenshot)
  5. Click on the skull icon
  6. When the dialogue prompts you for a password enter "24344241893" (without quotes)
  7. Congratulations, you've unlocked a new gold assignment called "Phantom Initiate"

Good luck!