These are simple strategies to defeat Pilfer for the Family Fighter achievement. Note that you can fight all these pets regardless of whether their world quest is up or not, so you can grind out the whole achievement in one day if you really want to. These strategies assume all of your pets are level 25 and of Rare quality.
Pass. Switch back to Sprite. Life Exchange. If Snozz’s Flank hits three times, your Sprite WILL die and you’ll need to restart the fight. Pass. Bite. Howl. Swap to Nether. Call Darkness. Nightmare. If Nightmare misses, start the fight over. Howl. Surge of Power. This strat is pretty RNG-dependent so you may need a few tries for it to work.
Pass. Manually switch in Tiny Apparition. If he was already switched in by Snozz, just pass. Curse of Doom. If your Apparition dies, you have to restart the fight. He just has to stay alive, no matter how low his health is. Pass. Creeping Fungus. Stampede. Claw. Claw.
Pass. Extra Plating. Crush. Pass. Prowl. Pounce. Rake. Explode. Bring in your Minfernal. Explode. Pounce. If your Abyssal’s health is too high, restart the fight fresh, let him get hit once, forfeit, and restart the fight again. This will make the health values better so the switches happen properly for the strategy.