XCOM 2

Resistance Comms is a facility that increases the number of regions you can make contact with. It requires researching Resistance Communications (which requires completing a Guerilla Ops mission, which you will do early in the game). The cost of this facility is $110 ($160 on Legend), it requires 3 power, the build time is 16 days and the monthly upkeep is $25. Each Engineer assigned to the facility increases the total number of contacts by 2. You will need to build a few of these if you want to contact every region on the map (needed for Global Resistance) so this trophy should come naturally. You can see the total number of contacts you have by opening up the Geoscape and looking in the upper right corner of the screen.