in my achievement diary it says to do this, i figured id mine shilo gems to get trade sticks to buy a opal machete, it did not update.

 

 

 

 

 

so how do i do it?

I think this is the one where you need a gout tuber and two gems, and can trade with one of the villagers (can't remember which one) for a machete.

 

 

 

Buying through the village shop does not work for achievment diary I am told.

 

 

 

Best of luck!

Safta Doc is the NPC you are looking for. He is right beside the anvil in the village