Challenges are a feature of Halo: The Master Chief Collection added with the launch of Season 2: Spark. Challenges can be earned in all gameplay modes of The Master Chief Collection across all games, and upon completion provide the player rewards of XP for ranking up and 
Season Points to spend on player customisation items such as armor permutations for Halo: Reach and skins for Halo: Combat Evolved. The addition of challenges allows players who don't wish to engage in competitive matchmaking multiplayer a way to still earn progression via campaign, Firefight, custom games and even Forge.
Challenge types
Challenges are divided into three categories; Weekly PvP, Weekly PvE and Seasonal, with a special fourth category available on occasion for in-game events. The weekly challenges reset every Wednesday, providing a constant new source of activities to do, while the Seasonal challenges reset at the launch of a new Season. As such, Seasonal challenges take longer to complete but offer larger rewards.
Weekly PvP
PvP challenges can be unlocked by playing Social and Competitive multiplayer matchmaking. These challenges typically offer 15,000-25,000XP and 0-1, and can be unlocked for winning matches, performing kills with certain weapons/ vehicles, earning Medals and other similar tasks.
Weekly PvE
PvE challenges can be unlocked via Campaign and Firefight, involving the killing of AI enemies. They tend to revolve around completing missions and. killing certain enemy types.
Seasonal
Seasonal challenges, as their name suggests, are long-lasting challenges that take up an entire season.
Season 2: Spark challenges
The following seasonal challenges can be unlocked in Season 2: Spark. As Spark is the first season to contain challenges, no challenges are available for Season 1: Noble.
| Name | Requirement | Rewards | Games | Notes |
|---|---|---|---|---|
| Trusty Sidekick | Kill 500 enemies with the Pistol. | All games |  Pistol Golden skin |
Can be unlocked in campaign, and Firefight on Heroic or Legendary difficulty, or in competitive multiplayer. |
| Thanks, Misriah | Kill 500 enemies with the Assault Rifle. | All games |  Assault Rifle Golden skin |
Can be unlocked in campaign, and Firefight on Heroic or Legendary difficulty, or in competitive multiplayer. |
| Zero-Five-Eight | Kill 500 enemies with the Sniper Rifle. | All games |  Sniper Rifle Golden skin |
Can be unlocked in campaign, and Firefight on Heroic or Legendary difficulty, or in competitive multiplayer. |
| Hot Shotty | Kill 500 enemies with the Shotgun. | All games |  Shotgun Golden skin |
Can be unlocked in campaign, and Firefight on Heroic or Legendary difficulty, or in competitive multiplayer. |
Event
Halo 3 Celebration
For the launch of Halo 3 on PC, the following challenges were made temporarily available between July 14 and July 29, 2020. After the end of July, the Alliance Nameplate and Acrophobia Skull were made automatically unlocked to anyone who signed into The Master Chief Collection prior to the launch of Halo 3: ODST. After the launch of ODST, the Alliance nameplate will no longer be accessible, while Acrophobia will be added to the menus for all players.[1]
| Name | Requirement | Rewards | Games | Notes |
|---|---|---|---|---|
| Acrophobia | Kill 343 flying enemies in the Halo 3 campaign. | Halo 3 |  Acrophobia Skull |
Valid enemies include Banshees, Drones, Aggressor Sentinels and Phantoms. |
| Three's Company | Complete three Halo 3 co-op campaign missions. | Halo 3 |  Alliance Nameplate |
Can be unlocked in campaign, and Firefight on Heroic or Legendary difficulty, or in competitive multiplayer. |