Contraband Police

A quick way to get this achievement is at the start of a new day request a transport and then restart the day. Repeat until the achievement pops.

To get this you need to get perfect rating on every inspection for a single day. This means you must catch all smugglers and retrieve all contraband, and catch all faults in every person you reject/accept for entry.

I believe this achievement can also only be achieved in the late game when you have unlocked all inspection types.

You can get this achievement naturally via doing multiple playthroughs (you will need to do approximately 3.5 playthoughs) or you can boost this achievement by playing until day 7 where you will encounter your first outpost attack.

When this occurs pause and hit win+r and search for your appdata folder: LocalLow>CrazyRocks>ContrabandPolice and copy the "save" folder. I recommend creating a backup of this save, but so long as it is on your clipboard you should be okay. Proceed to complete the attack and finish the day, alt+f4 out of the game, delete the new save and replace it with your backup, proceed back into the game and complete the day again. Repeat until pop.

Note: I recommend turning off cloud synchronization for the game as it will sometimes replace your backup with the cloud file. To do this right click the game in your steam library > properties and untick the steam cloud box.