Worldsoul-Searching

Completing the Worldsoul-Searching rewards the [item=258188] mount and a Replica Dark Heart of Galakrond decor.

[achievement=40244] Defeat the following bosses on any difficulty.
[achievement=41222] Defeat the following bosses on any difficulty.
[achievement=41598] Defeat the following bosses on any difficulty.

All That Khaz
Khaz Algar Flight Master Visit each Flight Master in Khaz Algar to discover their flight points for your Warband.
Khaz Algar Glyph Hunter Complete the following Glyph Hunter achievements in Khaz Algar:
Loremaster of Khaz Algar Complete the Khaz Algar quest achievements listed below.
Khaz Algar Lore Hunter Discover the following lore objects across Khaz Algar.
Khaz Algar Diplomat Reach max renown with each of the reputations listed below.
Allied Races: Earthen Complete the War Within storylines listed below.

You Xal Not Pass
Slate of the Union Experience life as the Earthen do by completing the achievements below.
Adventurer of the Isle of Dorn Complete 10 of the following special encounters across the Isle of Dorn.
Treasures of the Isle of Dorn Discover the hidden treasures across the Isle of Dorn.
Flat Earthen Become the victim of a workplace accident in the Forgegrounds of Dornogal.
We're Here All Night Participate in the following Theater Troupe plays:
A Star of Dorn Unlock all actor perks for the Theater Troupe.
Rocked to Sleep Read the plaques of the following inert earthen.

Rage Aside the Machine
Adventurer of The Ringing Deeps Complete 10 of the following special encounters across The Ringing Deeps.
Treasures of Hallowfall Discover the hidden treasures across The Ringing Deeps.
Treasures of The Ringing Deeps It's Not Much, But It's Honest Work - Title: Machine-Warden
Super Size Snuffling Obtain 100 Odd Glob of Wax
Notable Machines Read the following Notes On Machine Speakers in The Ringing Deeps.
Not So Quick Fix Repair 6 busted earthen consoles in The Ringing Deeps.
To All the Slimes I Love The critters of The Ringing Deeps might not be as fluffy, but they still need your /love.

Crystal Chronicled
Adventurer of Hallowfall Complete 10 of the following special encounters across Hallowfall.
Treasures of Hallowfall Discover the hidden treasures across Hallowfall.
The Missing Lynx Pet the ferocious warcats around Hallowfall.
Mereldar Menace Set a bad example.
Biblo Archivist Locate all the lore books in Hallowfall.
Beacon of Hope Contribute Radiant Remnants to light lesser keyflames and complete the following quests.
Sharing the Light Complete each of these bonus events found at the larger activated Keyflames.
Lost and Found Return every lost Hallowfall memento found with Maera Ashyld.
[achievement=40313] Contribute 100 Radiant Remnants to any Keyflames.
Children's Entertainer Play every game with the orphans of Mereldar.

Azj the World Turns
Adventurer of Azj-Kahet Complete 10 of the following special encounters across Azj-Kahet.
Treasures of Azj-Kahet Discover the hidden treasures across Azj-Kahet.
You Can't Hang With Us Be expunged from the City of Threads by guards.
The Unseeming Acquire 100 stacks of Unseeming Shift in the Maddening Deep or the Writhing Fields.
Worm Theory Complete the following quests in Rak-Ush and the Wormlands.
Itsy Bitsy Spider Wave to the following weave-rats.
Smelling History Read the following Azj-Kahet books while under the effects of Polymorphic Translation.
Bookworm Read the following books while under the effects of Polymorphic Translation.

Isle Remember You
[achievement=41045] Complete the Siren Isle questline "A Song of Secrets".
Siren-ity Now! Complete the following weekly quests on the Siren Isle.
Excavation Projects Contribute to each of the following excavations on the Siren Isle Command Map.
Clean Up on Isle Siren Defeat all of the rare creatures found on the Siren Isle.
Treasures of the Storm Open 10 Runed Storm Caches found around Siren Isle.
A Choir of Citrines Collect each of the Citrine gems on the Siren Isle.

The War Within Pathfinder
[achievement=20118] Complete the following storylines in the Isle of Dorn.
The Ringing Deeps Complete the following storylines in The Ringing Deeps.
[achievement=20598] Complete the following storylines in Hallowfall.
[achievement=19559] Complete the following storylines in Azj-Kahet.
Khaz Algar Explorer Explore the regions of Khaz Algar.

Glory of the War Within Delver
Delve Loremaster: War Within Complete the War Within delve achievements listed below.
The War Within: Leave No Treasure Unfound Find and open all Sturdy Chests hidden throughout the War Within delves.
Sporesweeper Successfully complete a Fungarian delve without being hit by Explosive Spores on Tier 8 or higher.
Spider Senses Successfully complete a Nerubian delve without spawning ambushers from Nerubian Webs or taking damage from Nerubian Eggs on Tier 8 or higher.
Daystormer Successfully complete an Order of Night delve without being targeted by Artillery fire on Tier 8 or higher.
[achievement=40538] Raise Brann Bronzebeard to level 25.
The War Within: Leave No Treasure Unfound Find and open all Sturdy Chests hidden throughout the War Within delves.

Defeat the Seasonal Nemesis (You need 1 Achievement here, not all 3)
My First Nemesis Defeat Zekvir in his lair before the release of the next season of delves.
My New Nemesis Defeat The Underpin in his lair before the release of the next season of delves.
My Stab-Happy Nemesis Defeat Nexus-Princess Ky'veza in her lair before the release of the next season of delves.

Going Goblin Mode
Adventurer of Undermine Complete 10 of the following special encounters across Undermine.
Treasures of Undermine Discover the hidden treasures across Undermine.
Nine-Tenths of the Law Successfully unlock all five of Muff's Auto-Lockers throughout Undermine.
Read Between the Lines Read the following lore books in Undermine.
That Can-Do Attitude Find enlightenment by cleaning the streets of Undermine by kicking Discarded Cans.
You're My Friend Now Make friends with all 5 Grabbable Rats in Undermine.

Owner of a Radiant Heart Reach Renown rank 10 with Flame's Radiance.

Unraveled and Persevering
Remnants of a Shattered World Defeat all of the rare creatures found on K'aresh.
Treasures of K'aresh Discover the hidden treasures across K'aresh.
Explore K'aresh Revealing covered areas of the map.
Bounty Seeker Pet: [npc=245499]
Dangerous Prowlers of K'aresh Pet the following purrkins in K'aresh.
Power of the Reshii Fully upgrade the Reshii Wraps.
Secrets of the K'areshi Discover the following lore objects in K'aresh.

Perhaps because I prepped knowing it would come but this one felt a lot less tedious than previous expansion metas :)
Seems like it is missing some real stinkers like Flamegard's Hope, which I approve of.

The War Within version of meta achievements in previous expansions, such as:

A Farewell to Arms
Back From the Beyond
A World Awoken