Missing Achievement Item

[spartacus82]

I completed my rank 3 hunting log for the maelstrom and received the achievement "Bump on a log: maelstrom" but upon completing the achievement I did not receive the item "Mammet #003L"
Can anyone tell me how I'm supposed to get the item, I checked my inventory and the was no item in there I could use to receive the item. Any help would be great.

[Inquisitor]

Talk to Jonathas at Apakallu Falls in Old Gridania. You 'Tell him the story' of your great achievement and he gives you the item.