Here is the full list of all 32 Police Tactics: Imperio achievements.
Own 12 police cars simultaneously.
Solve 250 cases (including story missions).
Remove 3 Crime Rings.
Remove a Crime Ring by arresting its leaders.
Remove crime ring under 180 seconds.
Arrest a group of criminals while they are on the way to commit a crime.
Remove 5 speeding areas.
Purchase a bonus room.
End a car chase under 20 seconds.
Fail to solve 10 cases.
Solve 100 cases (including story missions).
Upgrade a room to maximum level.
Have 12 employees in your HQ.
Catch a speeding vehicle with a camera van.
Obtain a Speeding Camera Van.
Solve 25 cases (including story missions).
Employ four officers simultaneously.
Unlock the second district.
Respond to a crime in under 15 seconds.
Finish a Story mission.
Solve a case after your Investigators failed to gather evidence.
Fail a story mission
Promote a rookie to an Officer.
Purchase a vehicle.
Unlock all districts in the city.
Fill all bonus slots.
Upgrade all rooms to maximum level and fill all bonus slots.
Raise the average safety of your unlocked districts above 99%.
Stop an escaping car with a roadblock.
Finish the Story.
Own 3 helicopters simultaneously.
Lower the average safety of your unlocked districts below 10%.