Hint: Intel Pieces

Expect to find the following number of intel pieces on the corresponding mission listed.

* Mission 1 – 8
* Mission 2 – 11
* Mission 3 – 4
* Mission 4 – 5
* Mission 5 – 5
* Mission 6 – 3
* Mission 7 – 2
* Mission 8 – 4
* Mission 9 – 10
* Mission 10 – 7
* Mission 11 – 5
* Mission 12 – 0
* Mission 13 – 7
* Mission 14 – 5

Unlockable: Project Harbinger Background

Beat the single player campaign on any difficulty to unlock the Project Harbinger menu background.

Hint: Easy Raining Men and Deadly Ballet Achievements

On the level named “Keegan,” after the firefight outside, follow Keegan. When you go through the door and jump down to train tracks, you will see a few dozen rats running toward you. Use slow-mo and then throw a grenade toward the running rats, killing and landing you the Raining Men and Deadly Ballet Achievements.