Molten Front: New Daily Hub provided by Blizzard with the Patch 4.2: Rage of the Firelands.
Veteran of the Molten Front

There are fourteen achievements involved in obtaining this title as well as many other rewards around it.
But to unlock the area, a player must play through the story line of Mount Hyjal on the Kilmador Continent in World of Warcraft.
Legacy of Leyara

The reward is an item that begins a quest chain that gives lore about Leyara's past.
Difficulty: 2/5
How to Obtain:
In order to obtain this achievement, the player must complete the following quests:
A Ritual of Flame: One of the first quest on the Molten Front questline, leads to the quest Leyara.
Leyara: gives a tiny hint of back story for Leyara, the druid of the flame, won't say anymore cause that would mean spoiler tags!
Into the Depths:
These quests are completed by following the story line of the Molten Offensive, the first two are completed before entering the Molten Front, the third is completed sometime after the player has recruited the Ancients for the battle.
The Molten Front Offensive
Reward: Flameward Hippogryph
The player must complete all aspects of the Molten Front Offensive, included recruiting all factions and completing a Moonwell, Hiring an Armorer, Finding a Fire Lasher, and saving an NPC.
Difficulty: 5/5
How to Obtain:
Stop the assault on the Sanctuary of Malorne: Achieved by playing through the story line of Mount Hyjal.
Gain access to the Molten Front: Obtained after collecting the players first 20 Marks of the World Tree.
Recruit the Druids of the Talon: Obtained by collecting 150 Marks of the World Tree, after opening the Molten Front.
Recruit the Shadow Wardens: Obtained by collecting 150 Marks of the World Tree, after opening the Molten Front
Recruit Elderlimb and the ancients: Obtained by collecting 125 Marks of the World Tree, after recruiting the Druids of the Talon, and Shadow Wardens. Though this is a three choice situation, picking between this or an Armorer or building the Moonwell.
Recruit an armorer: Obtained by collection 125 Marks of the World Tree, after recruiting the Druids of the Talon, and Shadow Wardens. Though this is a three choice situation, picking between this or recruiting Elderlimb and his anicents or building the Moonwell.
Build a moonwell: Obtained by collection 125 Marks of the World Tree, after recruiting the Druids of the Talon, and Shadow Wardens. Though this is a three choice situation, picking between this or recruiting Elderlimb and his anicents or an Armorer.
Find the Fire Lasher: Found by unlocking the Shadow Wardens Faction of the Molten Front, and killing a Druid of the Flame in the Widow's Clut
Save Anren Shadowseeker: Found by unlocking the Druids of the Talon Faction of the Molten Front, and found in the Molten Flow,
The Fiery Lords of Sethria's Roost
Reward: None
Difficulty: 4/5
Is Solo-able: Yes, but very difficult.
How to Obtain:
[WARNING]
All Fiery Lords should only be engaged while on the Protectors of Hyjal Daily Quest, otherwise a group of 3+ is required for easy killing of the Lords.
[WARNING]
Searris: Located on the Southern most Ridge, can be solo'd, but easier with a group, or another player that has a 10 second interrupt to interrupt the Ignite spell he casts.
Kelbnar: Located on the Northern most Ridge, can be solo'd, but is easier with a group, or another player.
Andrazor: Only Bird like NPC in the area, migrates around all the platforms or ridges in Sethria's Roost, can be solo'd, but is easier in a group, or another player.
Fah Jarakk: Located at 31, 86 on Sethria's Roost, can be solo'd, but is easier with a group, or another player. Fire Nova should be interrupted.
Fireside Chat
Reward: None
Difficulty: 2/5
Is Solo-able: Yes
How to Obtain:
Malfurion Stormrage: Hidden in the Cave of Malfurion's Breach in the Molten Front, you are able to recieve credit for this part of the achievement after first opening the Breach.
Matoclaw: Located in the Sanctuary of Malorne, provides many of the dailies for the Mount Hyjal portion of the Molten Offensive quests.
(Commander) Jarod Shadowsong: Can be found wondering around to Malfurion's Breach in the Molten Front.
Dorda'en Nightweaver: Can be found at the Sanctuary of Malorne, tending to the injured Runetotem.
Thisalee Crow: Can be found in the Molten Flow/The Furnace in the Molten Front, unlock-able with the Druids of the Talon, or by using the ghost glitch to gain access to the Molten Flow.
Arthorn Windsong: Attached to the Druid of the Talon faction unlock, provides a daily quest or two after the Druids of the Talon are unlocked, Singed Wings and Territorial Birds.
Deldren Ravenelm:is a quest giver near the Forlorn Spire. Players gain access to him by unlocking The Shadow Wardens, then The Hunt Begins, then The Forlorn Spire. He gives quests Pyrorachnophobia and Wicked Webs.
General Taldris Moonfall: Can be found west of the cave in Malfurion's Breach in the Molten Front, is the end to the Protectors of Hyjal daily quest.Ludicrous Speed
Reward:
Difficulty: 4/5
Is Solo-able: Yes, but more difficult without another to form a raid.
How to Obtain:
The best way to complete this achievement is to group up with another player in a raid group, and goes call as many of the large bird NPCs as quickly as you can.
And the Meek Shall Inherit Kalimdor
Reward:
Difficulty: 3/5
Is Solo-able: Yes
How to Obtain:
Angry Little Squirrel: Go to 35, 58 in Mount Hyjal near an area with living trees, there you will see squirrels. Drag an Enemy NPC near the trees to have the Squirrels unleash their justice by tossing acorns on the enemies heads causing a "bonk!" sound, to complete this part of the Achievement.
Hyjal Bear Cub: When saving the Bear Cubs out of the trees, instead of aiming for the trampoline, aim for one of the sleeping hounds to complete this part of the achievement.
Alpine Songbird: Just kill the boss NPC after completing the Call the flock quest to complete this piece.
Child of Tortolla: instead of punting the little turtle into the water, aim for an elemental that was attacking it and punt it into that elemental.
Gang War
Reward:
Difficulty: 2/5
Is Solo-able: No, need another player for a duel.
How to Obtain:
While on the Protectors of Hyjal daily quest in Sethria's Roost, engage another player in a duel and win.
Have... Have We Met?
Difficulty: 2.5/5
Is Solo-able: Yes
How to Obtain:
Using the Macro below should easily help complete this achievement. However, you may also be able to get each and every one of the targets from doing the Protectors of Hyjal daily quest as a NPC that helps you in Sethria's Roost.
/tar linken/tar chromie/tar thassarian/tar nat pagle/tar mankrik/tar hemet nesingwary/stopmacro [noexists]/wave
Infernal Ambassadors
Difficulty: 3/5
Is Solo-able: Yes, easier with a group.
How to Obtain:
This best way to complete this is to do the daily quests involving the Enemy NPCs in groups and burn them down before they have a chance to use their special attacks against the group. Otherwise solo-able for classes with interrupts since 3/5 of the NPCs spells they can use can be stopped, or are easily avoidable.
Flawless Victory
Difficulty: for melee: 4/5, for range: 2/5
Is Solo-able: Yes
How to Obtain:

Master of the Molten Flow
Difficulty: 4/5
Is Solo-able: No, Sentinels require a group for them to use their spell.
How to Obtain:
Three types of NPCs live in the Molten Flow, which can be accessed by either unlocking Druids of the Talon, or spirit falling through the gate in the Furnace area of the Molten Front. Once in the Molten Flow, you will need to fight Flamewalker Shaman, Flamewalker Sentinel, and Flamewalker Hunter, each having their own spells which either need to be used against them (Shaman), killed while a member of your party is under the effects (Sentinel), or avoided when used against you (Hunter). Not every NPC will use these special spells, and if they are not used within 5-10 seconds of engaging the NPC, it's not likely the NPC will use it at all.
King of the Spider-Hill
Difficulty: 2/5
Is Solo-able: Yes
How to Obtain:

(I may post a video showing how it's done in the near future.)
Death From Above
Reward: None
Difficulty: 3/5
Is Solo-able: Yes
How to Obtain:
After unlocking the Druids of the Talon faction, and saving Anren Shadowseeker from the Molten Flow under the Furnace entrance, the daily quest "Fire in the Skies", which allows the player to fly on the Trainable Fire Hawk into the Firelands to bomb spiders, flamewalkers and molten lords. Throughout the flight there is one continues flight that only ends after the player uses the 6 key, or click the ability of the Fire Hawk to go back to the Molten Front. However there is one catch, only one NPC that must be bombed spawns per day.
(Order found in)
Ragepyre: Off to the right as you leave the cinderweb area. He's atop a small barren hill.
Blazefury (second): Semi-hidden in the hills on the right as you leave Beth'Tilac's area via the ramp.
Flashfire (fourth): Semi-hidden in the hills on the right as you leave Beth'Tilac's area via the ramp.
Hatespark (first): In the cinderweb area (Beth'tilac's lair) on the western most part. He's slightly smaller than the other Firelords.
Heatflayer: As you're leaving the cinderweb area (or if you just arrived) and are flying down the ramp, look to the left atop a pillar.
Singeslayer (third): Off to the left as you leave Beth'tilac's area.
Ready for Raiding II
Reward: None
Difficulty: 3/5
Is Solo-able: Yes
How to Obtain:
Unlocked after offering 125 Marks of the World Tree to Elderlimb for the Ancients to join the fight on the Molten Front.
Ancient Firelord: Have two special abilities that must be watched for, Flame Spout and Flame Torrent.
Flame Spout: Will target all player/NPC(s) in the area, and form a circle of fire under their feet, after 3 seconds, it will erupt doing dmg to any still standing in the area.
Flame Torrent: Will target a player and cast a wall of flame away from the casting dealing dmg to anyone in the line of the wall.
Flame Spout: Will target all player/NPC(s) in the area, and form a circle of fire under their feet, after 3 seconds, it will erupt doing dmg to any still standing in the area.
Flame Torrent: Will target a player and cast a wall of flame away from the casting dealing dmg to anyone in the line of the wall.