Follow the Magic requires you to collect magic orbs from extractors, after defeating the tentacles of Nouris. I've done this event twice, once by itself and once from Tentacles -> Collect magic -> Defeat Valdis and my progress on the achievement has remained the same amount (11). I've logged in and out of the game and nothing changes.
Edit: Also happening with "If it ain't broke" I defeated Kryptis leaders and my progress didnt increase
Here is a video