I click on the plus sign next to required items, get a pop up but then can't see which items I need. I have to press escape to get rid of pop up as it won't scroll. How do you know which ones you need please?

Are you talking about collections like plushies, beanbags, stickers? Or smaller, like the Subeautique ones?

For the major ones like plushies, you would need to create an account on SubetaLodge and create a checklist which allows you to personally track the items have have and need.

For smaller ones like Subeautique you should be able to click on items needed.

Right now the current achievement page is a little messed up, Keith is testing out the new one in the Announcement forums.

Plushie, beanbags etc. You used to be able to click and it would show you what you had/didn't have without needing to go to Subetalodge. What a pain to have to add all your items there :(

It's not really a pain though, you can use the mass add feature, as long as you don't use Firefox, and it will update the collection's haves and needs