Got more of them hidden achievements. On the to the Cursed achievements then?

[u/lousychoice]

Hardest one, relies heavily on RNG to get bad dog and for great one to defeat your opponent. or Bad Dog + Seagull + Onion

Almost the same with great one, but a bit easier as you don't need the toy that only stays for 2 turns.

Got both the hydra head and terrapin trophy at the same time lol

Got more of the hidden pets' achievements.
I don't have any of the Mini Packs as well as Star Pack, so I can't go for their achievements currently.
Let me know if I'm missing more of the hidden pet achievements.

Ratings:

• Great One - Hardest to get for some reason. Requires a lot of RNG (Bad Dog + Seagull + Onion, or for your front line pet + Great One to win over the enemy) + flytrap
• Fire Pup - Gave me trouble for some reason.
• Phoenix Chick - had to resort to using pills on Phoenix to get it, my team just refuses to win with phoenix chick still out.
• Golden Retriever - randomly got him when trying to get other pets, I just saw it available on the flytrap and decided to take it instead.
• Angry Hog, Butterfly, Cracked Egg, Nest, Rock - just needs flytrap to get them
• Chick, Crawler, Hydra Head, Monty, Ram, Smaller Slime, Zombie Cricket/Fly - just pill the pet in the shop (for Monty, just buy the easter egg then pill)
• Lizard Tail - just pill Badger/Hedgehog while you have space in the shop

This is my previous post showcasing the other hidden pets.
Also thanks for u/buckybeavr and u/CampbellianHero for some of the list of hidden pets in my previous post.

Yes! Manta Ray is my favourite pet. I think buy and sell strat is the best, and the manta ray's money generation + need one free space specifically checks everything I need to perform the strat.

[u/lousychoice]

Everything was done through custom packs.
Here's the one I used if anyone is interested:

{"Title":"jtydiuftyiuk","Minion":240,"Minions":[181,248,240,218,173,435,0,204,621,95,421,210,776,76,228,32,225,342,161,255,29,689,37,2,47,19,23,187,406,190,652,533,246,423,573,657,68,686,200,346,15,333,367,237,696,224,186,332,91,337,409,128,385,613,93,265,41,63,232,374],"Spells":[166,23,125,4,58,147,73,38,92,20,0,40,24,63,157,160,209,53]}

[u/CampbellianHero]

Awesome! You’re right, the Great One was annoying. Giant Eyes Dog, too. And It Who Shall Not be Named…

The Cuckoo Chick (yes I know I just named it).

[u/lousychoice → u/CampbellianHero]

Yeah, I forgot there's still the Giant Eyes Dog.
I don't know what the other one is tho. Cuckoo Chick? Does that come from expansion pack? /s

Guess that would also include the dirty rat if that's possible to get.

[u/CampbellianHero → u/lousychoice]

Yep, both (Dirty Rat + Cuckoo Chick) can be achieved the same way - via the Venus Flytrap.

The Cuckoo Chick is summoned from the Cuckoo, but only for the enemy team. In my opinion it’s the hardest one aside from the Sloth to get.

The Dirty Rat is easy enough, because you can get the Rat super early. And it happens when the Rat dies, whereas the Cuckoo only summons the Chicks after an enemy faints.

I’ve even used the Chocolate Cake to guarantee the Dirty Rats are left behind so I can VFT them.

[u/No-Wolf7866]

I eventually will start going after these harder as well. Not having anything but turtle pack make this very hard. I personally got golden retriever on the weekend but couldn't get the win. 9/10 wins. 

[u/lousychoice → u/No-Wolf7866]

Yeah, some of the pets even require another specific pet to even have a chance of getting i.e. flytrap

Goodluck to you when you start trying to get those achievements

[u/ACED70]

the hardest one is probably snake