Hydrophobia

Hydrophobia is an achievement that is awarded for defeating in Temple of the Jade Serpent without being hit by the following abilities on Heroic difficulty:
 * Corrupted Water, the pulsing AoE that deals damage to anyone standing in any water.
 * Hydrolance, Maru's primary AoE ability in phase 1.
 * Wash Away, the phase 2 rotating AoE water blast.