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