Find them your self
Skulls
No. You are given them all.
There are many Gold Skulls. Look up a tutorial.
The skulls are hidden all over the map. To get them all you have to do is find them and pick them up.
There are various skulls you can find hidden in Halo: Combat Evolved. The first skull is hidden in the first room in the game behind some barrels.
there is 13 skulls 4 silver and 9 gold (the gold you only get the acheivments for).
you can find a video walk-through on youtube.com
they are hidden around the campain levels i forgot whear most of them are
Get all Gold & Silver Skulls.
no.... im a holo freak.... in fact to get skulls in halo you find them when you play each level... so each level has a skull hidden in it... you just have to look for it...
There are no skulls in Halo Reach.
Sadly, No. There are secrets, like the skulls for example. The skulls are cheats, but there hidden through out the level, and some, you can only get on specific difficulties.