Although this is story-related, it is still missable!
After you brought all the parts for your bike to Mo's garage, you are about to leave, but the police is waiting for you on the streets. Head back to the tower in the top right corner, set the alarm off (touching the ladder) and the cops will be distracted.
DON'T SKIP THE FOLLOWING CUTSCENE!
Skipping the cutscene will void the achievement.
At the end of the cutscene you will unlock the achievement.