I didnt get the achievement "the right questions" nor the from the new plot and i've been following it since the beggining...

I'm pretty sure i visited Skitter afterwards....more than one time....

Should I create a ticket?

the answer grelca gave here might help you.

It doesnt show up on the list...plus i don't have the item :x

It shows up as your most recent achievement on your list, so it's certainly shown as earned now.

[edit]

you have it now