I was going through the achievement page and stumbled upon the Halo 4 achievements section. At that point I did not know how long the Halo 4 campaign was, or what other Covenant species still exist in Halo 4. Upon reading the list I foudn out that there are (*) missions in Halo 4.
I added the Spoiler templates, but I am unsure of whether it is to be added to all of Halo 4's achivement pages. I am open to suggestions or views on this matter.