So I've been here for 6 years and I've had a LOT of pet color changes, and since I really like my pets how they are now, I'm not planning to change them ever again (also I've spent a lot of sP on them and I'm pretty much broke.) But with those new pet color achievements, I don't have the ones that I would have had if they were implemented years ago. Is there a way I can get them without having to change my pets again or is it impossible?

I happen to have extra pet slots, so I went to the Adopt R Us. There isn't a lot of choice out there right now, as ARU was just cleared. Nevertheless, I was able to find a Glade and Glacier and Nuclear pets fairly easily, and since there weren't any lilac I used one of my many Elixirs on one of the pets that was Common in there.
It takes about five minutes for ownership to register as far as teh Achievements go, so I use that time to give the poor hapless pet a minion and to book her in the Rathskeller.
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Well I also don't have any more pet slots available, 13/8 heheh. I wonder if there's a pet log to see if the pet's ever changed colors/species/names/etc? If that exists, maybe they could reward people whose had those colors before in the past but don't have them anymore.

I used to zap just for fun, so if this were possible I'd have all of them except Storm.
I don't think Subeta tracks this sorry, because if you make a mistake and re-color your pet there really isn't any remedy, nor is there one if you put the wrong pet in for Maleria or Italo.
I got 9 of the pet color achievements, should have 16 more though so bleh. I used to zap for fun as well, and that's how I got a lot of the colors before, but now I'm done with zapping and using potions and elixirs and stuff. But damn, I guess I'll have to do it again. Maybe if I get a gold account and another pet slot, I'll use it to get the ones I'm missing. Thanks though!

Or you could always use Teosinte - galactic is the cheapest to remake, the only issue is waiting until the right dates.
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Ah you're right, I didn't think of that! Waiting's no problem for me, I'm patient heheh. Thanks for the idea!

you could try to change one of your pets (like a galactic, which is a cheap color, like I did with Anton Zaslavski). After painting him cream, I abandoned him and started adopting some pets that were on the Adopt R Us. I still miss some of the achievements, but I'm zapping Anton right now... Even though I want Kumos' in the colors I miss the achievements, so those achievements I'll probably get as long as I get loyalty boxes (slots are just too expensive x_x)
Oh, and for the 13/8 slots, do what I said when you use an 1 week medal (you win one of those every year now, just visit your User Dashboard)
Yeah, I'll do that. Thanks!

Just a note, you don't get a 1 Week GA every year. You get one for the first year you're on the site, because it doesn't give a loyalty box (and since it was a new achievement, it was retroactive for those who have been here longer than a year).