guys all u have 2 do is get all achievments and at least be a luetinent ( excuse bad spelling ).
and then you get every thing except hayabusa.
4 hayabusa just get the skulls off the internet.

Really, contact Bungie on the situation, and it should be yours….

Blind Skull: In the “Sierra 117″ mission, when you get to the area where you see the Phantom overhead (one of the marines will point it out), jump over the rocks, and keep following the path on the right. When you get to the cliff, there will be a rock over the side. The Skull is on the end of the rock. The Skull description reads “Shoot from the hip.” Note: This Skull has to be activated before you start a campaign map.

Catch Skull: In “The Storm” mission, go to where the first anti-air Wraith tank is located. There is a large gray cylinder in the that area on the ground on the far side from where you enter. The Skull is on the top of the silo. To get up there, perform a grenade jump off a Warthog or use a vehicle to push a large crate to the side of it; jump on the crate, then the silo. Note: Do not destroy the Wraith near the door or the Skull will disappear. The Skull description reads “Pull pin. Count to three. Throw.” When this Skull is active, every NPC will carry two grenades and throws them often.

Alternately, take a Warthog, and park the front of it next to the cylinder. Take out a grenade (plasma recommended), and throw it at the front of the Warthog. Jump at the correct moment (usually as soon as you throw it) to get a little extra boost to your jump to get to the top to reach the Skull. This may require a few attempts.

Alternately, play in Co-op mode. Have a partner stand beside the building the Skull is on. Jump on top of them, then have them jump. At the peak of their jump, jump off of them. You will land next to the Skull. Collect it, then drop down to allow everyone else to get it.

Cowbell Skull: In “The Ark” mission, pick up a Grav Lift from the small building near where you fight the Scarab. Then, proceed through the level until you reach the second sloping hallway (stairway). You should see some partitioned risers (platforms) halfway down. The Skull is on the top level. Throw the Grav Lift on the right side of the hall so it lands on the fourth little green dot from the door. Then, run, jump, and use the Grav Lift to propel you to the top. You should reach a checkpoint just as you enter the room, so if you miss you can try again. When this Skull is active, explosive force is increased.

Famine Skull: In “The Ark” mission, when you first go into the valley to the right after the wrecked Phantom, look to your left to see a huge boulder. Use a Ghost to get to the side of the boulder that is closest to the bridge overhead. It is easy to pilot the Ghost up the side of the wall using the thrust. To get the Skull, pilot two Ghosts up the wall to the top of the bridge and stack them on top of one another next to the beam where the Skull is placed. Then, jump from the top of the Ghosts towards the Skull and land on the beam. The Skull description reads “Trust us. Bring a magazine.” When this Skull is active, dropped weapons will have very little ammunition compared to normal.

Use the following trick instead of trying to get a Ghost to the Famine Skull or risking your life with a grenade. Instead of going straight to it, go the way you do later in the level with the tank. Kill all the enemies or until one drops a deployable cover. Go the way you would have. When you get over the hill, destroy the Ghosts. Go under the bridge. You will see a big rock with a pathway leading up. Follow it. When you get to the top, turn to your right. It will not have a dirt ramp, but a wall. Walk up to it. Notice the small ledge. Jump up, and walk all the way to the right. Deploy the cover so that it lands about halfway down to where the bridge slopes. Do not throw too far or it go over the ledge. Jump on top of the cover. Jump up to the narrow ledge to get the Skull. Note: There is more than one way to jump from cover to ledge; try a few if you miss.

Fog Skull: In the “Floodgate” mission, as you are walking down from the anti-air gun you destroyed in the previous mission, there will be a ramp (next to a missile launcher). Around this ramp, there is a checkpoint. At this point, you should also hear a marine yelling, “There! Over There!”. Look up and to the right, directly at the roof of the building next to the missile launcher. There is a Flood form (not to be mistaken with the two other Flood forms jumping in front of you), which is holding the Skull. Kill him before he jumps, and he will drop the Skull down to the ground where you can retrieve it. Note: Correct timing is required because if you kill him too early, the Skull will get stuck on the roof. The Skull description reads “You’ll miss those eyes in the back of your head.” When this Skull is active, your motion sensor disappears.

Grunt Birthday Party Skull: In the “Crow’s Nest” mission, immediately after the first objective, while en route to the barracks, you will fall down to a pipe. Go to the end of that pipe, then look over the edge to find a small space a few feet below. Drop over, then quickly pull back to land under the floor you dropped from. The Skull is at the end of this area. When this Skull is active, it makes Grunts explode in confetti when they are headshot. There will also be some cheering, like a birthday party.

Iron Skull: In the “Sierra 117″ mission, after freeing Johnson and killing all the Covenant that come in the Phantoms, walk to the Pelican that arrives to pick you up. Face the cargo bay, but instead of going in, turn left and follow the path. Once you hit the wall, jump up to your right to eventually reach a walkway. Walk all the way to the end. Take a left, then a right. At the end of this, a little bit to the right is a dark corner. Press Up to turn your light on and you should see the Skull. If you cannot see it, you are probably standing on it. The Skull description reads “Death carries a heavy price…”. When this Skull is active, instead of losing 25 points when you die, you will lose 75.

IWHBYD Skull: In “The Covenant” mission, go to the last tower. Before you get to the Prophet of Truth, there are a series of bridges with Halos. Do not jump through any yet. First, kill the Prophet of Truth, and defeat the bridges of enemies. Then, jump through the Halos in this order, with “1″ being at the entrance and “7″ being the end near where the Prophet of Truth was located: 4, 6, 5, 4, 5, 3, 4. Alternately, jump through the Halos in the following order: 4, 5, 6, 5, 7, 6, 5, 4, 1, 2, 3, 2, 7, 2, 1, 3, 4, 6, 7, 5, 4, 5, 3, 4. This is much easier in Co-op mode with three or four people. This is the Halo theme if it was played on a phone by dialing the numbers. If done correctly, the Halos will start flashing, and the Skull will appear near the Prophet’s ramp. If the Halos do not flash, try again. The Skull description reads “But the dog beat me over the fence.” When this Skull is active, there is bonus dialogue throughout the game. IWHBYD stands for “I Would Have Been Your Daddy”, which is a level chapter from the original Halo. -From: crimsontwist

Mythic Skull: In the “Halo” mission, follow the normal path until you reach a cave. Follow the right wall until it branches off into a small path. At the end of this path is some rubble, and in front is the Skull. The Skull description reads “Coverage under the Covenant health plan.” When this Skull is active, you will get a 3x score multiplier for all kills.

Thunderstorm Skull: In “The Covenant” mission, after you shut down the first tower and get access to the Hornet, fly to the second tower (the one the Arbiter shut down). While walking up the stairs, go to the middle part that connects both, and there should be stairs leading up to a platform where the Skull is. The Skull description reads “Field promotions for everyone!” When this Skull is active, enemies will be much stronger.

Tilt Skull: In the “Cortana” mission, when in the circular type room with all the Flood, look for a small structure piece next to two archways. Jump on top if it, then go up on the rocks to the top left. Turn left and jump up again, then turn 180 degrees and jump to the rocks across from you. Then, follow the rock sticking out and leading up on top of the original circular room. The Skull is in a pool of blood. The Skull description reads “What was once resistant is now immunity.” When this Skull is active, enemies will have different body parts that are resistance to certain bullet types.

Tough Luck Skull: In the “Tsavo Highway” mission, once you get past the part where you are forced to leave your vehicle, you will go through a tunnel and onto an open freeway. Immediately after coming out of the tunnel, you will see a huge pipe with two yellow ladders. Climb the second ladder. You should see a Regenerator power-up. Proceed to your right onto a small platform ledge where the yellow chain link fence is located. Jump onto that ledge, crossing over the fence. Directly behind you should be a large column that is holding up the giant pipe you were just on. Below that is a walkway. Fall off the ledge onto the walkway. Walk to the end of that. You should see a hidden ledge with the Skull on it. A few attempts may be requires to jump across. The Skull description reads “Your foes always make every saving throw.”