you get it for buying all of the experiment plashes, not just one

Oh! Thank you ^^

You're welcome!

exactly what are all of the experiment plushies, do you mean the plushies of the experiment pets? Because I have the botched experiment plushie and I thoght that counted as one of them. I too have been wondering about this achievement, because I so badly want the item

You need to buy the the Experiment Plushies from the Cash Shop, all the others do not count. C:

HERE is what SubetaLodge says about it.

ok just to make this clear. do I need to buy all the plushies /from the cash shop/ (using CSC) to get the achievement or do I just have to have all the plushies that the cash shop sells. I only have 100 CSC and was gunna buy the one that costs 25 mil in sP with that, and then buy the rest with sP, which are around 2.5 mil each. that will still work right?

You have to buy them from the Cash Shop as far as I know.

dude.. if thats the case its far cheaper to just buy the backdrop...ah oh well thanks for your help! I woulve been pissed if i wasted all that SP for nothing lol

yeah, you need to buy them from the Cash Shop to get the background for free. So if you're buying your CSC with pure, unless you really really want the plushies, I'd just buy the background directly from another user if I were you XD

yea thats what im planning on doing, thanks for telling me before i bought them from the shops! x3 that would have been so bad on my part

probably cheaper to buy the plushies from user shops as well, since most of them are selling for less than the current price of 100 CSC. The reason they're cheaper is because of the Black Friday Sale in the Cash Shop, a lot of people bought them all when they were cheap to get the background. Now there are a lot of them on the market and voila! You get a good deal XD