Halo 4

For those doing this on their solo Legendary play through:

- You can die
- You can use all the ammo in your UNSC weapon and keep it until the end with no ammo
-Just dont swap it for another weapon.

It is best to use the Lightrifle(I think that's what it's called?) - It's the gun the Promethean Knights use

This mission took me just over 2 hours, good luck.

I have made a video strategy guide for this achievement, showcasing how the best way to pull this off if you're riding solo.

The video shows the whole mission, so it DOES CONTAIN SPOILERS. If you are struggling at any part of the mission then check out the video as ALL areas are covered. So long as you keep a UNSC weapon with you through the entire mission, the achievement is yours.

This achievement requires you to carry a UNSC weapon through the whole of mission 3 'Forerunner'.
If you die just revert to checkpoint and you will have your gun again.
The guns you start out with are the assault Rifle and the pistol.
This achievement is made easier if you're playing coop, one person can kill everything while the one getting the achievement hides.

SPOILERS

When you get to the end there will be a section, just like Halo 3's last mission, where you will have to use a ghost and boost all the way to the end without dying. If you die just revert to checkpoint and try again.
Make sure you have your UNSC weapon throughout the mission otherwise it wont unlock.

Hope this helps.

To confirm for people playing co-op you can die and re-pick up the weapon (in my case the magnum) and just keep it until the end make sure not to lose it though. Co-op is better as your friend can take most of the fire and keep you safe .
Happy Hunting

This is a fairly simple achievement. You start off with 2 UNSC weapons, the pistol and the assault rifle. There is no ammo for either of these guns throughout the entire mission. You have to rely on covenant and promethean weapons as your primary, and just keep one of the UNSC ones for backup. If you die, just make sure you have the UNSC weapon when you respawn.

This mission is fairly long, so it might take a while with one weapon. Patience is key.

I don't show the whole mission in the video, but instead cover the requirements of the video and some tips to get you through. Remember:

*You must be playing on Heroic difficulty.
*Don't die; you'll respawn with Forerunner weapons.
*If you do die, revert to last save.
*Ammo will be limited, so bring a co-op partner if you can to help distract the enemy fire.

The achievement pops as soon as you jump into the last portal, so if you don't get it then you may have to try again. Good luck, let me know if you have any additional questions.

Video credits: Rooster Teeth / AchievementHunter.com

This is fairly easy until the end of the level. Follow any of the guides above. If you are playing legendary during the last part of the level do the following:

Walking through the corridor you will find a cache of weapons and a ghost. Ride the ghost to the end of the tunnel. The doors to the outside wyill open. Immediately to your left an elite will spawn and try to make it to a banshee behind him. Kill him but DO NOT get in the banshee. Instead boost all the way to the cave to the right while killing as many grunts and elites as possible. Once you have cleared this area it's possible to shoot the shield orb through a window from the safety of the cave. A check point should pop once you destroy the orb. This part takes a while because you are using the ghost as a turret. Once all banshees are down continue to use the ghost to kill all of the other grunts, jackals and elites in the level. Once you do that use either the banshee at the beginning of the level or the one on top of the ridge all the way to the left of the stage to drop at the door without having to deal with the elites on the bridge.

Also, I died solo during the ghost scene. Still got the achievement, but you won't have to worry about respawning with enemy weapons.

This is my Rifle, This is my Gun - 20G (Original Achievement)

Difficulty: 5/10

This Achievement is best unlock while playing in Co-Op with friends that preferably already have it unlocked. I also suggest you put the Iron skull on, this way when one of you dies, you will immediately restart from the last checkpoint and no one will have to worry about losing their UNSC weapon. Just make sure you do NOT trade both the Assault Rifle and Magnum for different weapons. You can trade one but keep the other with you.

Note: If you were to be playing in Co-op without the Iron Skull on, you can pick up your UNSC weapon from your dead body and finish the level, it will still count. However if it were to fall off a cliff or you fell off a cliff in general, you will want to have the leader restart the last checkpoint before the next one is made.

If you chose to have friends help you, you can have your friends kill everything off for you all the way through the level until the part where you escape in the suped up Ghosts. From here have them leave the game and you complete this part alone. (Trust me having 4 people try the Ghost area with the Iron skull on is a HUGE mistake) Although while you are alone, you will want to revert to the last checkpoint immediately if you feel you didn't make a jump or enter a cave in time, as the Iron skull will force a single player to start the mission over upon death. Once you enter the portal the Achievement will unlock.

You can also do this solo if you like but it will take much longer.

You can just use everything in the unsc weapon,just leave some ammo in it.Then just use your second weapon.Try to find some UNSC ammo to the side.I personally just didn't touch that slot.DO this from the last rally point.If you have already done all the mission then you can.