You can start the following Eye for an Eye missions when you're done with the W4tched Main Operation. We'd recommend you unlock the APB Research upgrade as well as purchasing the Quadcopter remote control vehicle before you continue to make things a bit easier.
Grab Horatio's phone and watch the cutscene, head to the next marker and watch another, then head to the gang hideout.
A Brutal Discovery
Stealth is tricky here as there are a number of dogs patrolling the area that can't be distracted through any hacking shenanigans. Climb in through the large window as you approach, make your way to the upper level as quietly as you can, head to the server area, and take out the enemy guarding it. Download the data and head for the second objective, hack the sprinkler controls, and make a run for it.
Head for the docks and speak to your contact on top of the containers, then make your way to the edge of the dock near ship. If you have the Quadcopter then deploy it towards the far right corner and use it to hack the enemy and obtain the keycode which will allow you to enter the ship in relative safety.
There aren't many opportunities to set environmental traps and due to the layout it's another area where combat is likely to be unavoidable, but there's a lot of cover available, and one advantage of attracting enemy attention is that their grenades may inadvertently do your job for you. As soon as the last objective is destroyed jump overboard and swim to safety - if you have the ability to put out an APB then doing so just before you leave will cause the enemies and the police to get into a shooting match to cover your escape.
Speak to your next contact on the roof, and take out the marked enemies - a non-lethal knockout is enough, so laying traps and staying out of sight should do the trick. If you've got the quadcopter this becomes trivial as you can just hover out of sight and track your targets, wait for them to pass a hackable object, and take them out while you remain safely on the roof.
Want more tips? Our Watch Dogs 2 walkthrough and guide provides an overview of everything you can do in the open-world game, from all finding all Key Data locations, unique vehicles and finding hidden gnomes and gnome outfit, through to tips on races, ScoutX, Driver SF and multiplayer. We also have walkthroughs on Trophy and Achievement specific side-quests Ubistolen, $911 and Shadows as well as how to get more Followers and how to make money.
A Real Dog Fight
Speak to your last contact and then head for the hideout opposite. Don't worry about attracting attention too much on your approach as once you're through the door it locks behind you, keeping out any pursuers. Head down the lift, hack the door of the dog cage to release the hound, and then either lure it back to its cage with the Jumper before entering, or run in and knock it out.
Note at this point, there is a trick to get easy cash by hacking Pablo over and over, allowing you to get $18,000 every 40 seconds. It's a great way to get cash fast, and the technique is fully explained in our how to make money in Watch Dogs 2 page.
Switch to NetHack and activate the camera to locate the guard with the keycode, then unlock the door - depending on how quickly you deal with the dog you may need to wait a while for Pablo's speech to finish so that the guard moves into place.
Once inside the main area either head straight down the slope or take the stairs down to the right and deal with Pablo - a head-on assault is by far the quickest option, particularly as the enemies will start fighting with a rival gang and be a little preoccupied.
Once Pablo is down retrace your steps to the elevator and leave the building - there'll be a guard outside the door as you leave, so deal with him quickly and run down the alley to the right to avoid further conflict.
Next up is the Hack Teh World mission.