As far as I understand the description you have to close 5 portals within 15 minutes after the world event started.
Well … I’ve done this several times now … still no achievement or even a “1/5 portals”
We’re investigating, but it’s worth mentioning that closing pirate or molten events do not count as portals.
Edit: Also, after you close your first portal you will receive a buff for 15 minutes. All the portals need to be closed while the initial buff is active or you will not receive credit.
