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Mechanical Melee
Defeat the corrupted pets of Argus with all Mechanical pets.
Mechanical Melee requires you to defeat the corrupted pets of Argus using only Mechanical pets, and is one of ten family-specific achievements that together form the Family Fighter meta-achievement, rewarding the 
Felclaw Marsuul.
Understand the Encounter Format
All fights against the corrupted pets of Argus are single pet encounters, and you can challenge them at any time without a World Quest being active.
Defeat Watcher
Use Iron Starlette (abilities 1, 1, 2) and Mechanical Pandaren Dragonling (abilities 1, 1, 1 — use Explode, not Decoy). Open with Wind-up, Wind-up, then Explode on Iron Starlette; when it dies, bring in Mechanical Pandaren Dragonling and use Breath, Breath, then Explode to finish.
Defeat Gnasher
Use Stonegrinder (abilities 2, 1, 1), Anodized Robo Cub (abilities 1, 2, 1), and Lifelike Mechanical Frostboar (abilities 1, 2, 2). Start with Stonegrinder and use Woodchipper to make Gnasher bleed, then switch to Anodized Robo Cub for Maul then Bite until the Cub dies, then bring in Frostboar and use Headbutt, Pig Out, Charge, Charge to finish Gnasher off. An alternate team of Anodized Robo Cub (1, 1, 1), Cogblade Raptor (1, 2, 1), and Tranquil Mechanical Yeti (2, 2, 2) also works: open with Maul then Bite until the Cub dies, bring in the Raptor and use Screech then Bite until it dies, then finish with Thrash or Ion Cannon on the Yeti.
Defeat Ruinhoof, Baneglow, Retch, and Deathscreech
Tranquil Mechanical Yeti and Clockwork Gnome are sufficient for these encounters; build turrets and use basic attacks to win.
Defeat Foulclaw and Gnasher (harder fights)
Add Darkmoon Zeppelin to your team alongside Tranquil Mechanical Yeti and Clockwork Gnome, and use Decoy after Lightning to survive the harder mechanics.
Defeat Bucky and Mar'cuus
Use Darkmoon Zeppelin, Clock'em, and Sky-Bo as your team for these two encounters.
Tips
All corrupted pet battles on Argus can be attempted at any time, so there is no need to wait for a World Quest reset to make progress on this achievement.