Unlimited Potential

At the bottom of the stairs to Malkorok's platform is a corrupted Skullsplitter. For the achievement you need to kite him into Malkorok's room and then make him sit in the Breath of Y'shaarj where he will transform into the achievement mob.

Some important notes:

- The Skullsplitter will do Arcing Blast a couple times followed by his Breath of Y'shaarj which will kill anyone standing on it. I would recommend marking the Splitter's Arcing Blast with a certain colour mark as to avoid confusion with Malkoroks.
- Position the Skullsplitter in the middle so that his Arcing Blasts are not skewed awkwardly across the platform
- Use a stun or knockback to ensure the mob is inside Malkorok's Breath of Y'shaarj when it is cast.
- Malkorok will do 3 Arcing Smashes followed by the Breath.
- After he is hit, the Corrupted Amalgamation will be healed to full and should be killed ASAP, and then finish the fight as normal.
- If you wipe, the Skullsplitter will respawn down in his original position at the bottom of the stairs.

To earn this achievement you have to visit [zone=6738] raid instance, and find there [npc=71454] boss.
Before the stairs that head to the boss you'll find some Blood Axe mobs, they keep chained another mob - [npc=72983].
Slay guards and pull mob to the boss. Start the fight. You have to let [npc=72983] being hit with [spell=142842] (Malkrok cone spell).
As it happened, mob transforms into [npc=73265]. Slay Malkrok now, you dont have to slay Amalgamation as well.

Achievement is a part of Glory of the Orgrimmar Raider.

Unlimited Potential — https://www.youtube.com/watch?v=fWjpYRDs9bI

We killed the Skullsplitter on our way to Malkorok, on our run back from first wipe the mob had respawned, so at least if you mess up the achieve you can retry easily.