For this achievement you need to kill 4 bosses in Gundrak, explanations below.
Slad'ran
- This is a tank and spank, the only thing noteable is that he will summon snakes and serpants at 30% health. They will zerg your group and hit very hard on heroic.
- It is recommended to tank this boss in the doorway and to have ranged dps on the stairs, this way the tank can pick up the adds.
Drakkari Colossus / Drakkari Elemental
- The boss will split into a Colossus and Elemental.
- As a Colossus he is just a tank and spank.
- As Elemental he is much harder, everyone needs to make sure they are not in the poison on the ground.
Moorabi
- Really easy boss just interrupt his Transformation whenever possible, it will increase his damage by 25%.
- Casters stay at max range to avoid his AoE damage.
Gal'darah
- A few things to watch out for, first he will summon a ghost rhino which charges a random party member.
- When he whirlwinds all melee dps and the tank need to move out of it because it stacks a wicked damage over time on them.
- When he turns into a rhino you must heal the impaled party member and keep yourself and the tank topped off.
- You need to collapse on each other during this phase, if he has to charge you, you are dead.