Online contracts become available after finishing a short interrupting mission in Act 1, where you're given a tutorial on online hacking in particular. There are four types of primary contracts, three of which have trophies tied to them.
As you complete more contracts, your online reputation will go up and you'll receive slight bonuses in the form of skills. These can be viewed by pressing in the skill tree. The online-earned skills are overall not going to be long-stay skills, so don't stay too attached to those bonuses.
Perhaps the most common form of contract, hacking involves one player looking for another as their search radius hones closer and closer on the target. The radius you have to stay inside of decreases after every +25% towards installing a backdoor, so you'll want to place your starting radius strategically. Unless you have an absolutely flawless hiding spot, it'd be wise to move to other positions every once in a while. Using blackouts at nighttime helps quite a bit, as this makes you even harder to see.
Finishing ten hacking contracts (as in reaching 100%) rewards you with a trophy, as well as some weapons along the way.
Invade and successfully hack 10 enemy Fixers in Online Hacking
Online tailing is by far the least intrusive online contract. In this type of contract, you must simply follow your target for a certain amount of time without them being aware that you're doing so. The challenge is now on you to keep up with your target as they move around the map (or if you're lucky, they'd be idle). Staying closer to your target will add more %age to your observation than if you were farther away. If you can keep them in your sights until you reach 100% observation without them profiling you, you'll successfully finish a tailing contract. Tailing increases at a higher rate when you're close to someone who is driving a vehicle.
Finishing ten tailing contracts also requires you to reach 100%, and gives you a trophy and weapons.
Complete an Online Tailing without being detected
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Invade and successfully observe 10 enemy Fixers in Online Tailing
You must also be tailed five times yourself for a trophy, but this is fortunately doable with friends since the online community should be small enough to pinpoint each other after a while. Missions and minigames will prevent you from being tailed, so if you're willing to rely on luck for a while, avoid these.
Players that engage in online racing are put into a racing lobby, in which they must complete a course before time runs out. After someone finishes in first place, all other racers have a short amount of time to cross the finish line so they can officially place on the board. A race will only count as completed towards your totals if you manage to finish The problems here are that first, the online is going to be pretty dead, and second, you have to be fairly close behind first place if you want the race to count.
Online decryptions require 3-8 people and are sort of a free-for-all, with everyone fighting over a certain file. The longer you have the file, the more you decode it, and the goal is to be able to decode it before anyone else does.
This type of contract is not required for trophies, nor does anyone play it these days anyway. You do get sets of gear for completing up to ten decryptions, however.
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