phantom unable to unlock assignments

So if I understand you correct you have had them unlocked for a bit and it is not doing any progresses even though you have done the kills? 

If so then....

Follow the Steps to contacting an EA Game Adviser to fix this :

1 Click here to go to the EA contact page. http://help.ea.com/en/

Note: Top left pick your Country :]

2 Select your game and platform, Then click next.
3 Select a topic and write about your problem.
4 Click next and select your preferred contact method.
5 Ask for a callback if you can as it is fast when I used it.

Or use this

You can contact EA here: http://help.ea.com/en/contact-us/

http://help.ea.com/ca/article/welcome-to-the-new-and-improved-ea-help-center/#contact

The call back feature available to North America, Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Hungary, Ireland, Italy, Netherlands, Norway, Poland, Portugal, Russia, Spain, Sweden, Slovakia, Switzerland, and the UK.