After the first cargo ship is destroyed, you will get the option to create a base. It is north-west to the starting spot where the civilians come out of.
A little north of the base on the west is a skyscraper. There should be a little black switch next to it. Activate the switch by pressing A on it, then Adam will come out of the building.
Protect Adam as he walks to Cargo 2. Once he gets into it, the achievement will unlock.
(easiest done on easy)