Hello!
Any advice on how it's achievable?

My build : https://garmoth.com/character/CpbdI6xWvN

Summary:

TET Manos Gatherer's Clothes

All TET Manos Accessories

PEN Manos Hoe (already have)

x2 Sethra Artifacts - Gathering Mastery +10 each, set: Yawning Hedgehog +20

Khan's Lifestone +25

x14 Vital Crystal: Gathering +140

Seafood Cron Meal +25

Skill: Guru 50

Enhancing to PEN is not an option.

Buying PEN is not an option: too expensive, also I dont like anybody's names on my gear I bought and I dont want to buy Perfume of Erasure (or whatever its called) from Pearl Shop.

With this setup I can get 1905 Gathering Mastery.

Book of Florin easily hits 2k, but it's somewhat rare, hard to get, so is unreliable.

Thanks in advance.

According to your link you are 2305 hoe mastery, you go by hoe mastery not Gathering mastery when you are using a hoe.  The only thing getting 2,000 gathering mastery will help with is water scooping, bare hand gathering, and shovel digging in the desert.

I see, its Hoe Mastery.

Okay, now with this new information, it seems I can achieve 2k hoe mastery with only TRI set of accessories, just need to buy Khan Lifestone and get Yawning Hedgehog set, and probably wont spend 6.5B on Mastery life crystals if I grind more Guru levels.

Thanks for clarifying.

hoe mastery... heh