Near the border between Ashora and the Dendrome you will find quite a few bases full of Architect scouts. These mobs all count towards the cheevo.
/setwaypoint 3483 6506
/setwaypoint 3892 6300
/setwaypoint 4231 6215
You can also kill the groups of scouts that you will find at the taken over border control points.
At the border control points you can also pick up a daily to kill 60 of these scouts. You need to mentor down to 65 for the scouts to count towards this quest, but you don’t need to stay mentored down if you just want to finish the cheevo.