Completing the campaign on legendary will automatically unlock all lower difficulties.

Make sure you play the LASO playlist. Don't just start each mission with all skulls on. Otherwise you won't get the achievement! You can get to the playlist as shown below.

MCC Main Menu > Campaign > Halo: Reach > Playlists > LASO Campaign

Tips:
- Always try and get the allied AI to tank the enemies allowing you to perform an easy backstab.
- Play it slow in certain areas, don't feel pressured to rush through an area.
- Backstab Elites or Plasma Pistol them until shield drops and go for a headshot.
- Needle Brutes and the rest you can usually headshot with a DMR.
- Shooting a charged Plasma Pistol directly to the ground will deal damage to you allowing you to
‏‏‎ ‎‏‏‎ ‎pick up health packs to get your shield back.
- Enemies aim for your body so leaving only your head visible allows you to shoot while in cover
‏‏‎ ‎‏‏‎ ‎allowing the cover to tank the enemy's bullets.

You can get both of these achievements together. This was the easiest method I found and worked for me. However, if you are really struggling try doing the CO-OP Method with the Wraith. Good Luck with this one.

Completing the campaign on legendary will automatically unlock all lower difficulties.

Make sure you play the LASO playlist. Don't just start each mission with all skulls on. Otherwise you won't get the achievement! You can get to the playlist as shown below.

MCC Main Menu > Campaign > Halo: CE Anniversary > Playlists > LASO Campaign

Tips:
- Be aware of the huge explosion range and dead grunts. Always try and keep your distance.
- Play it slow in certain areas, don't feel pressured to rush through an area.
- Backstab Elites or hope the grunts explosions drop the shields and go for a headshot.
- Try and headshot the grunts so they blow up the rest of the enemies.
- Enemies aim for your body so leaving only your head visible allows you to shoot while in cover
‏‏‎ ‎‏‏‎ ‎allowing the cover to tank the enemy's bullets.
- Always pickup overshield's or active camo to get through areas much easier.
- Watch out for marines throwing "suicide grenades". Believe me it's a pain.
- Try and use allied AI to get the attention of the enemy allowing you to run through certain areas.
- Learn how to do the Infinite Ammo glitch. Helps a lot on the harder missions. (Double tap r to reload and swap weapons on the floor, leave it for a few seconds and if you pick it back up it will have a full clip without using any ammo.)

These two achievements can be done together and I'd recommend doing it on a separate run

You can get No-Fly Zone in a normal play through but if you missed it you can do these both together to save some time.

These two can be done right next to each other.

If you are having trouble with the methods in the video above try the warthog method. However, I'd recommend learning the jump as it will help you get the hang of other grenade jumps if you are going for all the achievements.

I'd do both of these achievements in separate runs.

You can do these both together but I would suggest doing them separately as it's extremely hard just doing one of them.

Both of these can be found in the same room almost right next to each other.

If you happen to be doing this LASO on CO-OP there is a despawn bug that you can use to despawn all the enemies in the Engine Room. Allowing you to destroy the 4 reactors without getting attacked. You don't need to watch the whole video just the first few minutes to figure out where you stand.

Completing the campaign on legendary will automatically unlock all lower difficulties.

Make sure you play the LASO playlist. Don't just start each mission with all skulls on. Otherwise you won't get the achievement! You can get to the playlist as shown below.

MCC Main Menu > Campaign > Halo: 2 Anniversary > Playlists > LASO Campaign

Tips:
- Play it slow in certain areas, don't feel pressured to rush through an area.
- Backstab Elites when possible.
- Try and headshot the grunts.
- Enemies aim for your body so leaving only your head visible allows you to shoot while in cover
‏‏‎ ‎‏‏‎ ‎allowing the cover to tank the enemy's bullets.
- Utilities The Arbitors invisibility. It makes it easier to get through areas.
- Play on Classic Graphics. It makes it easier to see all the invisible enemies.
- Listen out for "angry" noises from enemies. It shows that they have found you but also leaves them open for backstabs.
- Try and use allied AI to get the attention of the enemy allowing you to run through certain areas.
- Mastery of the "Sword Flying" technique can help a lot. With both LASO and Speed Running. You can attempt this manually or attempt to set up a macro to automatically do it.

I found the banshee method a lot easier. When getting it through the final door in the tunnel make sure the banshee is opposite to the door. Should give it a straight line to follow you in. See this part of the video for what I mean.

If you are struggling with the banshee trick try the other methods to these achievements linked below. I'd recommend both of these achievements be done in a separate run.

GOOOAAAAALLLL!: Method 2

Scarab Lord: Method 2

These can both be achieved at the same time.

Both of these can be found in the same room.

Both of these can basically be found right next to each other. If you are struggling to make the jump normally try using the Sputnik skull to make it easier.

If you are struggling to get to either of these with a grenade jump turn the sputnik skull on. It should make the jump a lot easier to do.

Both can be found in the same location.

Both can be found pretty much right next to each other. If you miss the Skull just go back to last checkpoint and try again.

I'd recommend taking the spectre rather than the banshee. This allows you to get both of the achievements at the same time by driving it around the back. Go for the skull first then the toy. Go to last checkpoint if you mess it up and the spectre falls down the hill. Remember to park the spectre at the start of the level as shown in the video.

Seasonal Sign Dates:
January 1 - "Baby Shark Petting"
July 7 - "Are you finding Ling-Ling's head?"
October 31 - "Danger, Carnage Zone"
December 25 - "Danger, This Soffish, DO NOT EAT!"

On one of these days, in your local timezone, you will need to load a custom game in Halo 2 Classic on Zanzibar, and then go to the beach and look at the sign next to water. On the dates listed above, the sign will be unique and the achievement will unlock. I'd add one of these dates to your calendar.

I'd do the above 7 together on the map Bloodline.

I'd do the above 5 on Lockdown. Easier and quicker.

Both of these 2 above can be done at the exact same time.

I'd recommend trying to get all of these achievements first in case there aren't any players.

Everything in this section has to be done in matchmaking.

I'd just play some Slayer for these 2. Should get it quickly.

These 2 can be done normally in 4v4 but it will take a long time.

I'd suggest doing what I did and get 1 or 3 friends to queue for 1v1 or 2v2 slayer. (VPN to a lower player count country can help you get matched against each other. Australia worked for me.)

Aim for the map Lockdown and take turns getting the coils and ice. You can get splatters from the ice if the person getting killed gets hit directly in the head while looking at the ice. This way you get a splatter and environmental kill at the same time. Might take a few attempts to figure out the right spot and positioning but once you figure it out you will get them pretty consistently.

Focus the ice whenever it is up as you can use the coils for the environmental's but not the splatters.

If you don't get lockdown (which happens a lot) just go for other achievements on the other maps like backstabs or grenade kills, whatever you need.

If you need people for this achievement try putting a post in the Steam Discussions. A few people will probably be looking to do something similar.

Good Luck!

Completing the campaign on legendary will automatically unlock all lower difficulties.

Make sure you play the LASO playlist. Don't just start each mission with all skulls on. Otherwise you won't get the achievement! You can get to the playlist as shown below.

MCC Main Menu > Campaign > Halo 3 > Playlists > LASO Campaign

- Range shoot brutes. They have a short line of site so if you can sit far enough back they won't detect you while you charge a plasma pistol and use a BR or Carbine to get a headshot. Meaning they won't dodge your first attack.
- Similar to the range shooting method you can try pop shooting when in short distance. Charge a plasma pistol and quickly peak and shoot and get back in cover. They won't detect you meaning they won't dodge the shot.
- Shielded Jackals sometimes after charging the plasma pistol to long cause it to dissipate and renders the weapon unusable. Allowing you to easily walk up and melee jackals for a free shield.
- If a brute starts berserking aim to kill it immediately. Easiest methods are plasma, spike or fire bomb grenades. Alternatively go for headshots when possible.
- Carbine and Beam rifles are much better when fighting brutes. It takes less shots to drop there armour.
- Try and use some speed run tactics if you can in certain areas. It might allow you to get through without fighting anyone.
- Try and use allied AI to get the attention of the enemy allowing you to run through certain areas.
- Finally go for backstabs when ever you can. It will help and save ammo.

I'd do both of these in separate runs.

Both can be done right at the start of the level.

This can be done on any level and might trigger randomly. IWHBYD just makes it more likely and that spot seems to be one of the more consistent places to get it.

Both can be found in the same room.

All 4 can be found at the start of the level basically right next to each other.

Sigil Dates:
January 1st (New Year's Day): Make Love Not War
April 22nd (Earth Day): A skull with a recycling sign
May 5th (Cinco De Mayo): Toady Was Live!
July 4th (Independence Day): BBQ at Bob's
October 31st (Halloween): A grave stone that has the initials "R.I.P."
November 11th (Veteran's Day): Kilroy Was Here
December 25th (Christmas): A Christmas light with an “X” marked through it

On one of these days, in your local timezone, you will need to load a custom game in Halo 3 on Valhalla, and then go to the giant metal wall/structure in the middle and side of the map. Then head to the graffiti and look at it. On the dates listed above, the sign will be unique and the achievement will unlock. I'd add one of these dates to your calendar.

Both can be done at the same time just change the game mode as you switch maps.

You must do the skulls below in Forge, not custom games!

Completing the campaign on legendary will automatically unlock all lower difficulties.

Make sure you play the LASO playlist. Don't just start each mission with all skulls on. Otherwise you won't get the achievement! You can get to the playlist as shown below.

MCC Main Menu > Campaign > Halo 3: ODST > Playlists > LASO Campaign (You can do either LASO but I'd do the shorter one so it isn't as hard.)

- Range shoot brutes. They have a short line of site so if you can sit far enough back they won't detect you while you charge a plasma pistol and use a BR or Carbine to get a headshot. Meaning they won't dodge your first attack.
- Similar to the range shooting method you can try pop shooting when in short distance. Charge a plasma pistol and quickly peak and shoot and get back in cover. They won't detect you meaning they won't dodge the shot.
- Shielded Jackals sometimes after charging the plasma pistol to long cause it to dissipate and renders the weapon unusable. Allowing you to easily walk up and melee jackals for a free shield.
- If a brute starts berserking aim to kill it immediately. Easiest methods are plasma, spike or fire bomb grenades. Alternatively go for headshots when possible.
- Carbine and Beam rifles are much better when fighting brutes. It takes less shots to drop there armour.
- Try and use some speed run tactics if you can in certain areas. It might allow you to get through without fighting anyone.
- Try and use allied AI to get the attention of the enemy allowing you to run through certain areas.
- Give other ODST's (Invincible Characters/Main Characters) Heavy Weapons like Fuel Rods, Spartan Lasers or Rockets. This will allow them to tank the damage while also being able to kill hard enemies for you.
- Finally go for backstabs when ever you can. It will help and save ammo and get your health back. Remember Plasma Pistol and the normal pistol are your best friend.

All 4 of these can be done together. However, if you are struggling do the top 2 on Heroic and the bottom 2 on Legendary.

I'd recommend just doing these 2 or the Audio Logs to make it easier to keep track. Then do the other option in a separate run. However, you can do them all at the same time if you wanted.

Find below the best route to get all the Audio Logs as well as a few tips.

Notes:
- Select "Mombasa Streets - Rally Point 4" on Easy to have an open map to collect these.
- These can be picked up in any order, and the achievements will unlock in order.
- Audio Log 30 requires the first 29 audio logs.
- Audio Log 30 is located on a different mission.
- Find a mongoose in the weapon's caches to travel more quickly.
- Using VISR will highlight the audio logs in yellow.

- If you do this solo, you can quit to the main menu and select Data Hive. If you do this co-op you must complete kikowani station and then continue to data hive. audio log progress is not saved in co-op!

I'd recommend doing "Two Places, Same Time" in a separate run to make it easier.

Both can be done at the same time.

Completing the campaign on legendary will automatically unlock all lower difficulties.

Make sure you play the LASO playlist. Don't just start each mission with all skulls on. Otherwise you won't get the achievement! You can get to the playlist as shown below.

MCC Main Menu > Campaign > Halo 4 > Playlists > LASO Campaign

- Play it slow in certain areas, don't feel pressured to rush through an area.
- Backstab Elites when possible.
- Try and headshot the grunts or backstab if they are running.
- Enemies aim for your body so leaving only your head visible allows you to shoot while in cover
‏‏‎ ‎‏‏‎ ‎allowing the cover to tank the enemy's bullets.
- Similar to the range shooting method you can try pop shooting when in short distance. Charge a plasma pistol and quickly peak and shoot and get back in cover.
- Try and use some speed run tactics if you can in certain areas. It might allow you to get through without fighting anyone.
- Try and use allied AI to get the attention of the enemy allowing you to run through certain areas.
- Don't hold a plasma pistol when charged as it depletes it. Only charge and shoot to save ammo.
- Knights tend to get stuck in a grenade throwing animation. Try and zigzag your way closer to them and when you think it's right sprint behind them and melee them.
- Aim to kill Watchers before killing any knights are they will just respawn them.
- Use the Carbine to shoot elites shields down from a distance. Most UNSC weapons take to much ammo. As a side note it takes 2 Plasma Pistol charges to drop an elites shields on this Halo so you are better off staying far away with a carbine or going for a melee kill.
- Finally go for backstabs when ever you can. It will help and save ammo.

Both can be found in the same area. "You're No Chips" sometimes doesn't work. You need a specific dialogue to happen. Just go back to last checkpoint if it didn't pop or rally point bravo.

Completing the episodes on legendary will automatically unlock all lower difficulties.

You are allowed to die on this just finish the mission and it should pop.

Both of these can be at the same time.

Completing a mission on legendary will automatically unlock all lower difficulties.

Completing all mission's on legendary will automatically unlock all lower difficulties.

You will get these passively while you do all the other achievements in the campaign's but if you want to farm them specifically just click on any of the achievements. Good Luck!

You will unlock most of these passively by doing all the other achievements but if you still need them I would focus on winning multiplayer games while there is still a player base.

You don't need to worry about these as you can do it in customs solo. (Start Slayer for example solo and just end the game...repeat)

Just focus on winning the matches above and you will get some of these by just playing the game. Thought feel free to go for specific ones when ever you want.

Earn a total of 250 CTF Mode Specific medals in matchmade games.

You will passively unlock most of these by doing the campaign and other achievements. Otherwise you can grind these on firefight if needed or follow each individual guide.