Since the other guides didn't make this clear, I'll clarify hoping that I save some people wasting 30 hours of their life getting this poorly tracked achievement.
This achievement is awarded for giving birth to both
the standard animal and the variant.This means that breeding a variant does not knock two birds with one stone
. If you deploy "Grizzly Bears" and their first child is an "Albino Grizzly Bear", you have to wait for them to give birth to a standard "Grizzly Bear" before you can mark that breed as 'Done'.
To be extra safe, I would recommend not taking any pictures of any non-mini animals unless it's a Level 1 that was born in your Zoo. The in-game tracker is completely useless at tracking this as it ticks "Bred" if you give birth to a variant (and it ended up forcing me to re-do everything again since I had no idea which ones the game felt I missed).
I have compiled a spreadsheet (linked below) for you to download to help assist with this. Again, note that there are two "Bred" columns which are not linked
It has not been discovered as to whether or not this reliably unlocks across births in all Zoos, but for an achievement like this I recommend playing it safe by sticking to one challenge zoo - it will take you around 20 hours for this achievement alone.
DLC Animals are not counted, so you can skip all of those.
Level 15 animals do not breed, so release and replace them ASAP.
Occasionally the Helicopter freaks out or stops collecting animals you're releasing/selling. If this happens, save and return to menu, then load again.
Filling out the photo album for the hidden coins is not required for this achievement - though when you have idle time and millions in the bank, you could always just temporarily place an extra Exhibit and snap the coins from it.
Technically filling out the animal photo album isn't required for this achievement either, though you'd be foolish to not do it on the way.Strategy
Don't worry about guests and money - I finished this with over 5 mil in the bank and once you cover your park properly the guest numbers don't really move around 15k much unless something is actually wrong (ie Toilets broken down). Complete the challenges, including the silly racing ones, as much as you can in the first hour to get useful boosts. If you get donated an animal, house it for the prize money then sell it.
Start placing small and mini exhibits until you're able to replace the small exhibits with Mediums (do that ASAP). Once you start turning a small profit (as in >$30 per tick) then make sure you start doing Park Research - Prioritise the Research tree, followed by the cheaper running of Exhibits, Concessions then Facilities, then Animal Transport, *then* breeding.
If you lay out your park properly you should be able to place 6 medium exhibits (one of each type), four mini exhibits, and place Concessions/Toilets around them so that they cover the park (use the DPad Ping to check the radius of each feature - including animal coverage - to ensure your park is covered with everything - no need to overdo it, just make sure there's no major blind spots). For Decoration I just placed a Medium Lake in the middle of it all and a couple of statues.
Below is a screenshot of my park by the time I got the achievement if you need help with your layout - entrance is on the top left.
Potentially clearer image:https://1drv.ms/u/s!Asr4z0Bu0rVYw8F1vRpdV8VrCHBnrg
I wish you all the best of luck with this!