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