Watch Dogs
49 Achievements
1,250
System Mangler
Complete every ctOS Breach
30
How to unlock the System Mangler achievement in Watch Dogs - Definitive Guide
There are a total of 16 ctOS Breaches to complete. All should be revealed to you as you drive around the city, complete the story, plus as you takedown ctOS Towers and are shown on the map by a white square and arrow icon. A ctOS consists of you hacking multiple devices with the first will be the main one located on your map. Once hacked, 4 more will show up in-game and you'll now be given a set amount of minutes to head to those markers and hack these 4 new devices.
Making sure you grab all the hacks before the time runs out will net you one completion. Do the same for the other 15 and the achievement will unlock. You can view how many you have left if bring up your Smartphone, select the 'Statistics' App and then press to access the 'Progression' menu.
ctOS Breaches are listed as collectibles in the progression wheel. There are 16 total and you need to complete each one. Once you reach icon on the map, hack the device and it will unveil four more boxes for you to hack. You will have a time limit to travel to each of their locations to initiate each of the hacks.
Some of the ctOS boxes will require you to blow something up that is blocking your path and others will require you to use one or more cameras to get to. None of the time limits are back breaking and it gives you tons of time assuming you wouldn't know where the ctOS boxes are, but you'll know where to go if you watch this video: