We're Going to Need a Bigger Harpoon

This achievement ONLY counts lunkers that you personally summon by using 5x [item=194701]. Therefore 125x 50x* Ominous Conches are needed to earn this achievement.

It does not count:

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• Lunkers summoned by others
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• Lunkers summoned or harpooned by party members
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• Lunkers summoned by [spell=392270], the buff you receive when you loot an Ominous Conch. Even if you are the one who got the buff.
  

That said, lunkers summoned by other players can still drop Ominous Conches, so farming lunkers in a group is still an efficient way to acquire the conches.

The only difference between this achievement and Lots of Lunkers, A Whole Heap of Lunkers & Lunkers, Lunkers Everywhere is the those three DO count lunkers summoned from [spell=392270].

*Achievement changed from 25 to 10 Massive Lunkers on July 3 2024.

Go to Zaralekk Caverns main town hub.
Find Niffen Linecaster [npc=204818]
Fish at this spot, get Conchs 1 per 1-3min.
Get 125 Conchs, go to any Large Lunker Sighting fishing spot.
Drop your Conchs and kill whatever spawns.

I recently found out the best way to farm Ominous Conchs is by Opening Tuskarr Tackleboxes.

(N.B : You need to make sure you have Iskaaran Harpoon in your bag to ensure the Conchs can be found in the boxes)

You can also find Tuskarr Tackleboxes in abundance at Waking shore - Restless wetlands , it took me 1 - 2 Hours to get the required 125 Conchs for the achievement.