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