Full list of all 33 Infection Free Zone achievements.
The base game contains 26 achievements, and there is 1 DLC pack containing 7 achievements.
Bring a tank into your arsenal
Kill an enemy using planted explosives in a building
Kill 10 infected with a single grenade
Clear a Purifier Zone
Enact the Cannibalism law and obtain meat from a human
Kill an infected moose
Kill an infected bear