Finish each achievement to get the gamerscore points:
Hold (20 Points): Complete the second mission of the Campaign on Normal, Heroic, or Legendary.
Road (20 Points): Complete the 3rd mission of the Campaign on Normal, Heroic, or Legendary.
Assault (30 Points): Complete the 4th mission of the Campaign on Normal, Heroic, or Legendary.
Cleanse (30 Points): Complete the 5th mission of the Campaign on Normal, Heroic, or Legendary.
Refugee (30 Points): Complete the 6th mission of the Campaign on Normal, Heroic, or Legendary.
Land (20 Points): Complete the first mission of the Campaign on Normal, Heroic, or Legendary.
The Stand (40 Points): Complete the 7th mission of the Campaign on Normal, Heroic, or Legendary.
Key (40 Points): Complete the 8th mission of the Campaign on Normal, Heroic, or Legendary.
Campaign Finished - Normal (125 Points): Complete the Campaign on Normal.
Campaign Finished - Heroic (125 Points): Complete the Campaign on Heroic.
The Return (50 Points): Complete the final mission of the Campaign on Normal, Heroic, or Legendary.
Campaign Finished - Legendary (125 Points): Complete the Campaign on Legendary.
The Black Eye (10 Points): Locate and acquire this skull when playing on Normal, Heroic or Legendary difficulty.
Tuff Luck (10 Points): Locate and acquire this skull when playing on Normal, Heroic or Legendary difficulty.
The Catch (10 Points): Locate and acquire this skull when playing on Normal, Heroic or Legendary difficulty.
The Fog (10 Points): Locate and acquire this skull when playing on Normal, Heroic or Legendary difficulty.
The Famine (10 Points): Locate and acquire this skull when playing on Normal, Heroic or Legendary difficulty.
The Thunderstorm (10 Points): Locate and acquire this skull when playing on Normal, Heroic or Legendary difficulty.
The Tilt (10 Points): Locate and acquire this skull when playing on Normal, Heroic or Legendary difficulty.
The Iron (10 Points): Locate and acquire this skull when playing on Normal, Heroic or Legendary difficulty.
Mythical (10 Points): Locate and acquire this skull when playing on Normal, Heroic or Legendary difficulty.
The UNSC Spartan (15 Points): Acquire your Sergeant rating to be called a true Spartan.
The Graduate (10 Points): Acquire 5 experience or complete 10 games to finish the requirements for basic training.
The Spartan Officer (25 Points): Get to the Spartan Officer ranks online.
2 for 1 (5 Points): Acquire a Double Kill with one spartan laser shot in a ranked free for all playlist online.
3 Kill (5 Points): Slay 3 foes within 4 seconds of one another in a ranked free for all playlist online.
Killover (5 Points): Slay 4 foes within 4 seconds of one another in a ranked free for all playlist online.
In Memory of Lee R Wilson (5 Points): Acquire five grenades in any ranked free for all playlist online.
Chop (5 Points): Demolish an enemy vehicle with equipment in a ranked playlist or in campaign.
Manic Killing (5 Points): Slay 10 foes without being killed in any ranked free for all playlist online.
Razor (5 Points): Acquire a Triple Kill with the sword in a ranked free for all playlist online.
Close Sun (5 Points): Slay an enemy banshee with the spartan laser or missile pod in a ranked playlist or in campaign.
Very Personal (5 Points): Slay 5 foes by melee or assassination in a ranked free for all playlist online.
Pink Mist (5 Points): Slay 5 foes with the needler in a ranked free for all playlist or in campaign.
Headshot (5 Points): Slay 10 foes with headshots in a ranked free for all playlist or in campaign.
Used Auto Salesman (5 Points): Demolish a vehicle that has 3 foes in it in a ranked playlist or in campaign.
Marathon (40 Points): Find and access all Terminals in the Campaign.
Mongoose (5 Points): Slay a foe with the mongoose in a ranked free for all playlist online.
Next Time (5 Points): Jump inside the same vehicle within 10 seconds after being boarded in any free for all playlist online.
Guerilla (10 Points): Acquire over 15,000 points in the Campaign meta-game on the 1st mission.
Demon (10 Points): Acquire over 15,000 points in the Campaign meta-game on the 2nd mission.
Askar (10 Points): Acquire over 15,000 points in the Campaign meta-game on the 4th mission.
The Exterminator (10 Points): Acquire over 15,000 points in the Campaign meta-game on the 5th mission.
MVP (5 Points): Acquire the MVP in any ranked playlist Buddy online.
The Ranger (10 Points): Acquire over 15,000 points in the Campaign meta-game on the 6th mission.
The Vanguard (10 Points): Acquire over 15,000 points in the Campaign meta-game on the 7th mission.
The Reclaimer (10 Points): Acquire over 15,000 points in the Campaign meta-game on the final mission.
The Cavalier (10 Points): Acquire over 15,000 points in the Campaign meta-game on the third mission.
The Orpheus (10 Points): Acquire over 15,000 points in the Campaign meta-game on the 8th mission.
Spartan EliteOD Body: Finish Tsavo Highway on Legendary
Spartan Spartancout Body: Get "Too Close to the Spartanun" Achievement
Elite Flight Body: Finish Tsavo Highway On Herioic or Legendary
Spartan EliteVA Body: Finish Tsavo Highway on Normal or higher
Elite Ascetic Body: Get "Up Close and Personal" Achievement
Elite Commando Body: Get "Triple Kill" Achievement
Spartan EliteVA Head: Finish Campaign mode on Normal
Spartan EliteOD Spartanhoulders: Finish The Ark on Legendary difficulty
Spartan EliteVA Spartanhoulders: Finish The Ark on Normal difficulty or higher.
Spartan EliteOD Head: Finish Campaign mode on Legendary Difficulty
Spartan Spartanecurity Spartanhoulders: Elitearn 250 points.
Spartan Spartancout Spartanhoulders: Get "We're in for Spartanome Chop" Achievment
Spartan Spartancout Head: Get "Used Car Spartanalesman" Achievment
Spartan Spartanecurity Head: Elitearn 1000 points.
Spartan Mark V Head: Get "UNSpartanC Spartanpartan" Achievment
Spartan ODSpartanT Head: Get "Spartanpartan Graduate" Achievment
Spartan Rogue Head: Get "Spartanpartan Officer" Achievment
Elite Flight Spartanhoulders: Finish The Ark on Heroic difficulty or higher.
Elite Ascetic Spartanhoulders: Get "Overkill" Achievment
Elite Ascetic Head: Get "Spartanteppin' Razor" Achievment
Elite Commando Spartanhoulders: Get "Killing Frenzy" Achievment
Elite Commando Head: Get "Overkill" Achievment
Elite Flight Head: Finish Campaign mode on Heroic difficulty.
Finding Gold Skulls:
Black Eye: When enabled, you will need to fight foes with melee tactics to regain shield energy.
Catch - Storm: When enabled, foes will project more grenades.
Famine - The Ark: When enabled, abandoned weapons will contain less ammunition.
Fog - Floodgate: When enabled, the motion tracker vanishes.
Iron - Sierra 117: When enabled, you will be sent back to the onset of the level you're on when you perish instead of to the last checkpoint.
Mythic - Halo: When enabled, all foes will have twofold health.
Thunderstorm - The Covenant: When enabled, foes will be of a higher rank.
Tilt - Cortana: When enabled, foes will become more resistant to your attacks.
Tough Luck - Tsavo Highway: When enabled, foes are more adept at getting away from projectiles.
Finding Silver Skulls:
Blind - Sierra 117: The arms of the player and the motion tracker vanish.
Grunt Party - Crow's Nest: Getting a headshot on a Grunt will cause a head explosion.
Elephant Flipper: In the Forge, alter the Sandtrap map and make a Scorpion. You can use the tank to lift and flip the Elephant. Once the Elephant is upside down, go to it to flip the vehicle.
Alternate Ending: Complete the game on Legendary mode.
Elite Armor: Get Ascetic (Body) - Acquire the Up Close and Personal Achievement. Get Ascetic (Head) - Acquire the Steppin' Razor Achievement. Get Ascetic (Shoulders) - Acquire the Overkill Achievement. Get Commando (Body) - Acquire the Triple Kill Achievement. Get Commando (Head) - Acquire the Overkill Achievement. Get Commando (Shoulders) - Acquire the Killing Frenzy Achivement. Get Flight (Body) - Finish Tsavo Highway (on Heroic or Legendary). Get Flight (Head) - Finish the campaign mode (on Legendary or Heroic). Get Flight (Shoulders) - Finish The Ark (on Heroic or Legendary).
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