If You complete the indicated task You'll get the allotted gamerscore.
Operation: Anchorage (40) - Completed "Operation: Anchorage"
Aiding the Outcasts (20) - Completed "Aiding the Outcasts"
The Guns of Anchorage (20) - Completed "The Guns of Anchorage"
Paving the Way (20) - Completed "Paving the Way"
Nearly Indestructable power armor
If you've completed the operation Anchorage missions then you've probably already gotten the winterized T-51B power armor. This power armor is vertually indestructable. You don't have to repair it for a really long time. I've been using it for a while and it has not broken more than one cap value.
Fallout 3: Operation AnchorageMore guides, cheats and FAQS