Full list of all 55 Watch_Dogs 2 achievements worth 1,260 gamerscore. It takes around 40-50 hours to unlock all of the achievements in the base game.
The base game contains 49 achievements worth 1,000 Gamerscore, and there are 4 DLC packs containing 6 achievements worth 260 Gamerscore.
Trigger the hack of the century
Finish Operation: Robot Wars
Finish Operation: Shanghaied
Finish Operation: Power to the Sheeple
Finish Operation: Hack teh World
Successfully neutralize 5 fugitives in Bounty Hunter
Do a 140 meters long jump while driving a vehicle
Finish Operation: Ubistolen
Finish Operation: W4tched
Finish Operation: Shadow
Finish Operation: $911
Escape a Level 5 felony
Collect all the Key Data hidden in the world
Neutralize 1 Hunter in Bounty Hunter mode
Finish Operation: Eye for An Eye
Finish Operation: Hacker War
Complete 5 DedSec Events
Finish Operation: Limp Nudle
Finish Operation: Looking Glass
Buy 25 cars in car dealerships
Finish Operation: False Profits
Finish Operation: Haum Sweet Haum
Get all the eKart upgrades
Do a stealth takedown on 30 enemies
Do a bike race
Do a drone race
Do a sailboat race
Finish Operation: Cyber Driver
Use the "Call the cops" hack on the donut-disguised man in Haight-Ashbury
Take 25 ScoutX location pictures
Successfully complete an online Co-op Operation
Travel 200 meters on top of a car by hacking it
Take a picture of someone vomiting
Drive 4 km in the world while driving the Merengue from Elek Motors
Drive one of the Unique Vehicles
Pet 10 dogs
Ride a cable car
Buy the Gatorfeet Whine Country footwear
Buy a shirt in the Nudle vending machine
Successfully invade another hacker
Hack a robot
Hijack a boat
Get photobombed in a selfie
Hijack a bus
Make 3 jumps in a row aboard a vehicle
Buy a two handed weapon at the 3D printer
Buy some pants after the party
Buy all the apps in the App Shop
Erase your past identity in the Blume servers
Finish Operation: Off the Hook
Finish Operation: Caustic Progress
Finish Operation: Bad Medicine
Finish Operation: Automata
Reach the maximum win streak bonus in Showd0wn
Finish Operation: Moscow Gambit