Guild Wars 2

I’ve been spending almost two hours around New Loamhurst attempting to complete the Holding Back the Tide achievement with no luck. I’ve seen the same events spawn several times now and done them each time without any credit given for the achievement making me believe it’s bugged. Here are the events I seen occur:

• Destroy the cannon on the beach – South-west of Loamhurst
• Bunch of white mantle attacking seraph on the beach – West
• Clockwork vs Jade – East
• A white mantle event that spawns at the entrance of the swamp area – South

Aside from that, I have not seen any other events. So, either it’s bugged and not giving credit when it should. Or I’m missing an event somewhere that’s not showing on the map around Loamhurst. Can anyone help or confirm the problem?

Edit: Nevermind apparently there’s a rare event that only occurs occasionally.