If you mean the blue collectibles that all comprise their own achievements, you can use this guide here (I think you named the wrong achievement in your title, judging by your mention of the items):

https://forums.elderscrollsonline.com/en/discussion/129559/collectible-achievement-guide-spoiler-alert/p1

In my experience you have roughly 1/300 chance of actually getting a trophy to drop. Everfrost was the worst for me, I killed easily 500+ Ice Atronachs just going at it - only to have it randomly drop when I wasn't explicitly trying.

Grouping seems to make no difference RNG wise, but will speed up some just due to the higher killing power when with allies. Zone also does not matter - as long as the enemy is the right one, it doesn't matter when and where. The link I provided shows multiple locations, but only verified ones with a * beside them, but the "unverified" locations work just as well so if one area is boring the crap out of you, change the scenery.

Marcusito wrote: »

Yes the blue collectibles. Thanks for the guide. I’ll keep at it knowing it is possible.

I know how you feel, i’ve been farming them for ages, some just don’t drop for me, while I get tons of others..

My advice, choose 1-2 you want to have first, do you daily farm for 10-15 min. If it doesn’t drop, it will later. Don’t tire yourself farming for 2-3 hours in a row.

I killed thousands of mud crabs to get my polished shell

"frost astronauts" lol

Yah you can farm them at the south end of Reapers March map IIRC. That wasn't the hardest drop for me by far. Maybe I got lucky.

Brass Anklets were the worst for me. So many laps in that Greenshade temple...

You need to bring your Palico with you.