Full list of all 49 Watch_Dogs achievements worth 1,250 gamerscore. It takes around 40-50 hours to unlock all of the achievements in the base game on Xbox 360.
The base game contains 39 achievements worth 1,000 Gamerscore, and there is 1 DLC pack containing 10 achievements worth 250 Gamerscore.
Complete every Criminal Convoy
Complete every ctOS Breach
Unlock every song with the SongSneak app
Kill 4 enemies within a single instance of Focus
Unlock every Skill in the Skills Tree
Complete every Gang Hideout
Escape 15 Police Scans
Escape a level 5 police scan
Complete the final mission in the Weapons Trade Investigation
Complete every Investigation
Complete 40 Fixer Contracts
Complete the final mission in the QR Code Investigation
Complete every Privacy Invasion
Check in at every Hotspot
Complete the final mission of the Missing Persons Investigation
Complete the final mission in the Human Traffic Investigation
Collect all 8 Burner Phones
Complete Act 5
Complete Act 4
Escape 15 police chases
Complete Act 3
Complete Act 2
Kill 3 enemies with a single IED
Perform 10 vehicle take downs
Invade and successfully hack 10 enemy Fixers in Online Hacking
Unlock every ctOS Tower
Use the Crime Detection System to take down 20 confirmed criminals
Invade and successfully observe 10 enemy Fixers in Online Tailing
Complete an Online Tailing without being detected
Get tailed 5 times
Complete Act 1
Participate in 5 different City Games
Escape a level 5 police chase
Using non-lethal takedown, stop 10 civilians from calling to report you
Complete 10 Public Online Races
Tag 100 enemies
Shoot out a tire on 15 different vehicles
Take down Maurice
Complete level 10 against all 3 Drinking Game opponents
T-Bone: Kill 4 enemies at once by blowing up the RC Car
T-Bone: Complete all side investigations
T-Bone: Complete Act 3
T-Bone: Complete Act 2
T-Bone: Complete 20 Fixer contracts
T-Bone: Complete Act 1
T-Bone: Complete 20 Chicago South Club contracts
T-Bone: Complete 20 Militia contracts
T-Bone: Complete 29 driving missions
T-Bone: Complete 10 coop missions