Full list of all 48 Watch_Dogs achievements worth 1,250 gamerscore. It takes around 50-60 hours to unlock all of the achievements in the base game on Xbox One.
The base game contains 38 achievements worth 1,000 Gamerscore, and there is 1 DLC pack containing 10 achievements worth 250 Gamerscore.
Unlock every song with the SongSneak app
Complete level 10 against all 3 Drinking Game opponents
Escape 15 police scans
Escape a level 5 police scan
Complete 40 Fixer Contracts
Invade and successfully observe 10 enemy Fixers in Online Tailing
Invade and successfully hack 10 enemy Fixers in Online Hacking
Complete every Criminal Convoy
Get tailed 5 times
Complete 10 Public Online Races
Participate in 5 different City Games
Escape a level 5 police chase
Complete an Online Tailing without being detected
Unlock every Skill in the Skills Tree
Complete every Gang Hideout
Complete every ctOS Breach
Complete Act 5
Complete Act 4
Complete the final mission in the QR Code Investigation
Complete every Investigation
Complete the final mission of the Missing Persons Investigation
Collect all 8 Burner Phones
Complete the final mission in the Human Traffic Investigation
Complete every Privacy Invasion
Complete Act 3
Use the Crime Detection System to take down 20 confirmed criminals
Check in at every Hotspot
Complete Act 2
Complete the final mission in the Weapons Trade Investigation
Kill 4 enemies within a single instance of Focus
Kill 3 enemies with a single IED
Using non-lethal takedown, stop 10 civilians from calling to report you
Complete Act 1
Unlock every ctOS Tower
Shoot out a tire on 15 different vehicles
Perform 10 vehicle take downs
Tag 100 enemies
Take down Maurice
T-Bone: Complete 20 Fixers contracts
T-Bone: Complete 20 Militia contracts
T-Bone: Complete 29 driving missions
T-Bone: Kill 4 enemies at once by blowing up the RC Car
T-Bone: Complete 10 coop missions
T-Bone: Complete 20 Chicago South Club contracts
T-Bone: Complete Act 3
T-Bone: Complete Act 2
T-Bone: Complete all side investigations
T-Bone: Complete Act 1