what do i do once i have a halo 3 skull in my hands in the game?

[Amalio G]

i picked one up. once i picked it up, wat do i do with it?

 

[no_refillz]

wait until it says u got an achievement for finding the skull

 

[Beto S]

Just wait and see if it says you unlocked an achievement before you quit. If not go ahead and quit anyways. Some come up and some don't.

Or you can just finish the level holding the stupid skull.