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.
Successfully neutralize 5 fugitives in Bounty Hunter
Successfully complete an online Co-op Operation
Neutralize 1 Hunter in Bounty Hunter mode
Trigger the hack of the century
Finish Operation: Power to the Sheeple
Finish Operation: Robot Wars
Finish Operation: Shanghaied
Collect all the Key Data hidden in the world
Finish Operation: Hack teh World
Finish Operation: Eye for An Eye
Do a drone race
Buy 25 cars in car dealerships
Do a bike race
Finish Operation: W4tched
Take a picture of someone vomiting
Finish Operation: $911
Travel 200 meters on top of a car by hacking it
Drive 4 km in the world while driving the Merengue from Elek Motors
Do a 140 meters long jump while driving a vehicle
Finish Operation: Shadow
Finish Operation: Hacker War
Finish Operation: Limp Nudle
Finish Operation: Looking Glass
Finish Operation: Ubistolen
Complete 5 DedSec Events
Finish Operation: Haum Sweet Haum
Finish Operation: False Profits
Do a stealth takedown on 30 enemies
Hijack a boat
Get all the eKart upgrades
Escape a Level 5 felony
Pet 10 dogs
Drive one of the Unique Vehicles
Use the "Call the cops" hack on the donut-disguised man in Haight-Ashbury
Do a sailboat race
Buy the Gatorfeet Whine Country footwear
Hijack a bus
Take 25 ScoutX location pictures
Ride a cable car
Finish Operation: Cyber Driver
Hack a robot
Buy a shirt in the Nudle vending machine
Get photobombed in a selfie
Successfully invade another hacker
Buy a two handed weapon at the 3D printer
Buy all the apps in the App Shop
Make 3 jumps in a row aboard a vehicle
Buy some pants after the party
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