Infection Free Zone achievements

Survive 24 consecutive days without building walls

Survive 50 days in a single location

Gather 200 survivors at once

Kill 100 infected with melee weapons

Kill 100 infected by running them over

Find a prepper fallout shelter

Accept 10 groups of immigrants

Kill 1000 infected

Save the raiders

Build an antenna

Survive 12 days with only one survivor

Every type of weapon owned