There are a total of 57 Intel Collectibles in Fuse. Finding all of them will earn you the "The Inspector" trophy / achievement and reward you with bonus XP. They are scattered across all 6 story missions. The four Xenotech intel reports are obtained automatically in the first mission. If you miss an intel you can still get it via mission select.
Note: You can press the left stick to display your current objective. This video guide also shows the objective in the top left corner whenever a new collectible scene starts. This will help you figuring out if an intel is nearby.