WATCH_DOGS

Yep, you just have to start observing. You only need 100% the one time.

1) It does tell you when someone is tailing you and gives you a purple circle to go to.

2) You have to either reach 100% or have the player quit out for it to count.

My advice is to jump in a car and pretend you're part of the normal traffic flow - worked flawlessly for the five times I've tried this so far.

Purple circle? Thats hacking not tailing.....

@ xTGE I can confirm that if you try starting a mission of any type or try fast traveling it will mark the person tailing you with a purple circle similar to hacking I knew I was being tailed all 5 times it took me to unlock Traced.

Anyone know if this has to be consecutive? I failed once or twice, and my bar on the Xbox achievement progression thing reset.

@Reptar, nah it doesn't have to be consecutive. I've had heaps of problems with achievements in Watchdogs having delayed unlocks. Right now I'm at 100% for this one. Will do as Spartan said and go for an 11th.

Can you do it against friends?

With the new update you can. For both tailing and hacking.

Anyone want to boost this tomorrow 3rd September just msg me on xbox I'll be on in afternoon evening UK time

I tried boosting this with a friend and they did not count toward the total also when invading a friend no exp or money was earned.

Really? Okay ignore my comment. I only assumed
they would count.

Yeah it sucks because now I have to do this normal way and tat takes awhile

im stuck at 50%. I have have done it 10 times

You will not be notified that someone has invaded you through tailing, BUT if you scan NPCs their descriptions will change to "Not a threat", indicating that there IS a threat somewhere. "Losing" an online tailing has no consequence whatsoever for the invaded though, so you can just as well let people tail you if you're feeling benevolent.

can somebody confirm if it works with friends, because I've tried it several times and it didn't count it.

Ok I JUST got this one. It's honestly REALLY easy. I requested a target from the online menu and then either stayed out of their line of sight or hid in a car. I successfully tailed the target 10 times in a row and with no issues. I was expecting it to be a lot harder but the game must have been updated or something cuz it was way easy and only took me like 30 minutes. I just wish I could get people to tail me cuz I still need the Traced achievement

You CANT boost it with friends, but nowadays plenty of people are idling to get Traced achievement, so it shouldn’t be too hard.

Anyone know why I can't connect to the servers I really want to do the online ones?

Servers still up January 2022, I did a hard reset before starting the game and about 10 minutes into my session I got invited to the online races

You must first complete the Online Contracts Introduction at the start of Act 1 Mission 4: Backseat Driver to unlock Online Tailing.

While being invaded I had a purple circle for tailing missions & hacking missons. The only difference from my perspective was when you're being hacked there's an obvious progression bar that appears. So far I've only been "tailed" twice according to my achievement app, both times I was notified and a purple circle indicated their approximate location.

"The other player has no idea that your in his game Untill the end of the 100% or they spot you" (also, just a heads up until should be lower case and there's only one L)

I'm pretty sure either they patched the game or this information is just wrong. I've had people who would've had no idea I was in the game otherwise set up traps for me. For example I had one guy who I had to drive a small distance to, there wasn't any possible way he could've seen me. He pulled the bridge up so he'd know when I came and he had his car facing me. He was more or less stationary the entire time I entered his game, but as soon as I put the bridge down he sprung into action. I've also had several people hid inside buildings (coffee shops, bars, etc) before I was in the area clearly waiting for me. I never entered a tail where the person I was tailing appeared to be unaware of my presence. If they weren't pulling up bridges and crouching in coffee shops, then they were running around clearly searching for me.