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Cowabunga
Defeat Rasha'nan after all players ride a single wave per cast of Rolling Acid in Nerub-ar Palace on Normal difficulty or higher.
Cowabunga requires defeating Rasha'nan in Nerub-ar Palace on Normal difficulty or higher after every player in the raid rides a single wave each time Rolling Acid is cast.
Bring At Least Ten Players
A minimum of ten players must be in the raid group for the achievement to register correctly. Groups smaller than ten will not be able to complete this achievement regardless of execution.
Position Wave Targets Correctly
When Rasha'nan casts Rolling Acid, the two players targeted by waves should stand still and not ride either wave — the player sending the left wave stands far to the left, and the player sending the right wave stands slightly left of center. These two players are automatically counted as valid for the achievement even without a visible debuff stack.
Stack Raid In Center
The rest of the raid should be stacked centrally so that every non-targeted player gets hit by exactly one wave, receiving one stack of the Corrosion debuff. Repeat this positioning every time Rasha'nan casts Rolling Acid for the duration of the fight.
Monitor The Achievement Tracker
Watch the in-game achievement tracker during the fight — if the raid is executing correctly, the achievement indicator will turn white after a successful Rolling Acid cast. If a few players accidentally receive two or more Corrosion stacks, the achievement may still complete, so do not abandon the attempt immediately.
Tips
See the video guide for a visual breakdown of wave positioning during Rolling Acid.