Which achievements am I missing?

[SuperPhillip]

I didn't know which achievement topic to post this in, or if I was even supposed to.

Regardless, I know I need Astronomical, 200 Requests, and 100 Hours, but what's the other one? I must be tired or something.

[Lucent Beam]

?
You can just look on Xbox live...?

[The Pants Party]

You could have just looked at xbox.com, but you need to play 50 online matches for "Resident Roller."