Diggerer

Common artifacts in all of the archaeology tiers:

Fossil:
Beautiful Preserved Fern
Black Trilobite
Twisted Ammonite Shell
Insect in Amber
Strange Velvet Worm
Devilsaur Tooth
Ancient Shark Jaws
Vicious Ancient Fish
Feathered Raptor Arm
Shard of Petrified Wood
Imprint of a Kraken Tentacle
Proto-Drake Skeleton

Troll:
Zandalari Voodoo Doll
Fetish of Hir'eek
Eerie Smolderthorn Idol
Lizard Foot Charm
Jade Asp with Ruby Eyes
Feathered Gold Earring
Cinnabar Bijou
Atal'ai Scepter
Gahz'rilla Figurine
Skull-Shaped Planter
Bracelet of Jade and Coins
Drakkari Sacrificial Knife
Tooth with Gold Filling
Fine Bloodscalp Dinnerware

Dwarf:
Belt Buckle with Anvilmar Crest
Wooden Whistle
Bone Gaming Dice
Ceramic Funeral Urn
Worn Hunting Knife
Pewter Drinking Cup
Moltenfist's Jeweled Goblet
Stone Gryphon
Silver Neck Torc
Ironstar's Petrified Shield
Bodacious Door Knocker
Scorched Staff of Shadow Priest Anund
Dented Shield of Horuz Killcrow
Notched Sword of Tunadil the Redeemer
Winged Helm of Corehammer
Mithril Chain of Angerforge
Boot Heel with Scrollwork
Golden Chamber Pot
Scepter of Charlga Razorflank
Scepter of Bronzebeard
Skull Staff of Shadowforge
Dwarven Baby Socks
Warmaul of Burningeye
Silver Kris of Korl
Spiked Gauntlets of Anvilrage
Word of Empress Zoe
Pipe of Franclorn Forgewright

Night Elf:
Scandalous Silk Nightgown
Highborne Pyxis
Green Dragon Ring
Inlaid Ivory Comb
Coin from Eldre'Thalas
Cloak Clasp with Antlers
Shattered Glaive
Kaldorei Amphora
Hairpin of Silver and Malachite
Delicate Music Box
Chest of Tiny Glass Animals
Cracked Crystal Vial
Silver Scroll Case
Scepter of Xavius
String of Small Pink Pearls
Umbra Crescent
Necklace with Elune Pendant
Carcanet of the Hundred Magi

Orc:
Tiny Bronze Scorpion
Skull Drinking Cup
Tile of Glazed Clay
Gray Candle Stub
Fiendish Whip
Scepter of Nekros Skullcrusher
Rusted Steak Knife
Maul of Stone Guard Mur'og
Fierce Wolf Figurine

Draenei:
Strange Silver Paperweight
Anklet with Golden Bells
Scepter of the Nathrezim
Fine Crystal Candelabra
Dignified Portrait
Plated Elekk Goad
Baroque Sword Scabbard
Carved Harp of Exotic Wood

Nerubian:
Infested Ruby Ring
Scepter of Nezar'Azret
Vizier's Scrawled Streamer]
Spidery Sundial
Six-Clawed Cornice
Gruesome Heart Box
Ewer of Jormungar Blood

Vrykul:
Scramseax
Thorned Necklace
Flint Striker
Intricate Treasure Chest Key
Fanged Cloak Pin

Tol'vir:
Cat Statue with Emerald Eyes
Soapstone Scarab Necklace
Tiny Oasis Mosaic
Engraved Scimitar Hilt
Sketch of a Desert Palace
Canopic Jar
Castle of Sand
Sketch of a Desert Palace

Pandaren:
Apothecary Tins
Carved Bronze Mirror
Pandaren Game Board
Edicts of the Thunder King
Empty Keg of Brewfather Xin Wo Yin
Gold-Inlaid Porcelain Funerary Figurine
Pearl of Yu'lon
Standard of Niuzao
Twin Stein Set of Brewfather Quan Tou Kuo
Walking Cane of Brewfather Ren Yun

Mogu:
Cracked Mogu Runestone
Iron Amulet
Manacles of Rebellion
Mogu Coin
Petrified Bone Whip
Terracotta Arm
Thunder King Insignia
Warlord's Branding Iron
Worn Monument Ledger

Note that this achievement is not 50 artifacts solved for. You need 50 or more common artifacts in your journal, duplicates do not count.

What does a diggerer do?

http://en.wikipedia.org/wiki/Didgeridoo