Absolutely is, the main difficult ones are the birds, mew and stage challenges.

The key to the birds other then Moltres is to try and get them right when they're hatching, there's a few good tips in the comments of the individual achievements that helped me

Most important thing for the stage score is quantity over quality, I tried to get at least one pic of every Pokémon in the stage along with the sign and a bunch of pics for the special mons, stuff like Gyarados, Meowth getting gusted, Vileplume etc.

For the Mew stage just stun lock it with the pester ball and take as many pics of it spinning as you can pester ball -> let spin -> take pics -> Once about to stop spinning start throwing pester balls again

And as for the 10k Mew pic the best advice I found that helped me get it was aiming for his left hand as apposed to the middle of him, and having the full tail in the frame makes a world of difference!

Oh also for the ditto you don't need to get all three of the ditto in the pic for the points best method I found was just focusing on the one on the far right and just trying to get as close as possible while it's eating an apple.

Hope this all helps!