The questline starts in your base if done during the story, or in Plainsong after the story. Call Zo at the campfire before collecting cores from the Grimhorns. Tear the shoulder mounts off the Grimhorns to drop heavy weapons that will make clearing the area a breeze. Then talk to her again in your base (story) or Plainsong (after the story).
Next, go to each of the shrines and reboot the Land-gods (may need to be done later in the story). The Land-god at Cinnabar Sands is found under a large bounder. You will need to defeat a Stormbird to treat it. The Stormbird will fall out of the air if you tear off the component on its belly.
The Land-god at the lake is trapped behind some rubble. Follow the button prompt to remove the debris, then reboot the machine.
The Land-god in the Canyon requires you to open 4 metal flowers to remove the vines pinning it down. Once all Land-gods have the reboot code, meet Zo at Plainsong for a final cutscene and the trophy will unlock.