Alien Artifact Detector:
Complete all the Arkvoodle Cult missions in Albion. Speak to Shama Llama, then head to Bay City and complete the last Cult mission there. Then return to Shama Llama and do what he asks for the Alien Artifact Detector, which will cause nearby artifacts to appear on your minimap.
Furotech Cell Detector:
Finish all the Arkvoodle Cult missions in Takashima. This device causes all Furotech cells to appear on your minimap.
Final Arkvoodle Cult mission:
Collect 30 Alien Artifacts to access this final mission. The artifact detector can really help out with this. Completing this mission gets you the Datacore for the Burrow Beast weapon.
Collecting Alien Artifacts also will unlock various movies in the Archives.
Thanks to Revolution Readers Xenolover and Knighto!