I got a question i have a R99 item called Christines Graduation Plushie and i played with my pet like i was suppose to and it didnt give me the achievement...can somebody tell me what i did wrong?

Did your item disappear from your inventory? If it did not, it probably means that your pet was already "Very Happy" and didn't want to play with anything. If your pet doesn't actually play with the toy, it won't give you the achievement. You'll probably have to wait until your pet gets out of the resort or begins to get bored, sorry. :(

Not sure if you have it or not but go look at mine as I have that one it will tell you if you have it or not.