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