If you own the dlc but haven't beaten the missions this is how you unlock the dlc missions. This was the solution found on Ubisoft's website is is not my own.
What is included with my Human Conditions DLC? How do I access it?
The Human Conditions DLC introduces three new stories, new elite Co-Op Challenges, and a new enemy type (Jammer) to Watch Dogs 2.
The 3 new DedSec Operations will be unlocked individually as you progress in the main game.
You will discover them organically, just like operations from the main game!
- Caustic Progress will be unlocked once the Hacker Wars mission has been completed.
- Bad Medicine will be unlocked once the W4Tched, Eye for an Eye and Hacker Wars missions have all been completed.
- Automata will be unlocked once the Limp Nudle mission has been completed.
Of course, if you have already completed the main game, all missions will be available to you once you have downloaded Human Conditions!
EDIT: If you completed these missions need to wait until you get a call to do the mission first.
You can find the new missions in the DedSec App on the in-game phone. Will say DLC mission.
Comment below if you want a written or video guide or both when this drops Thursday. I will make a guide for all four as so as I possibly can.