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Aquatic Assault
Defeat the corrupted pets of Argus with all Aquatic pets.
Aquatic Assault requires you to defeat the corrupted pets of Argus using only Aquatic pets, and is one of ten family-specific achievements that together make up the Family Fighter meta-achievement, which rewards the 
Felclaw Marsuul battle pet.
Understand the Battle Format
All fights against the corrupted pets of Argus are single pet encounters, and you can battle them at any time without a World Quest being active.
Defeat Deathscreech with Hydraling
Use a Hydraling with Tail Slap, Call Lightning, and Whirlpool as your first pet. Open with Call Lightning, then use two Tail Slaps followed by Whirlpool. Follow up with a Gulp Froglet using Toxic Skin then Swarm, and finish with a Moonshell Crab using Moon Tears, Amplify Magic, and Arcane Slash.
Defeat Gnasher with Rip Combo
Use any two Aquatic pets with Rip and Blood in the Water — Chuck, Kelp Scuttler, or Muckbreath all work. Open with Rip, then Blood in the Water, then continue with Rip until Gnasher dies, switching to your second pet if needed. A third pet such as an Emerald Turtle with Headbutt can serve as a backup.
Defeat Ruinhoof with Crab Team
Use Hydraling (2/1/2), Moonshell Crab (2/1/2), and Ghostshell Crab (1/2/2). Open with Hydraling to get three hits in before it dies, then bring in Moonshell Crab to use its remaining buff and set up moonlight before it dies, and finish with Ghostshell Crab using its ability three times to secure the kill.
Tips
Two video guides are available for this achievement — see video guides linked for visual walkthroughs of each corrupted pet fight.
Completing Aquatic Assault alongside the other nine family achievements (Critical Critters, Elemental Escalation, Humanoid Havoc, Mechanical Melee, Beast Blitz, Draconic Destruction, Fierce Fliers, Magical Mayhem, and Unstoppable Undead) counts toward the Family Fighter meta-achievement, with roughly 180 total pet battles required across all ten.