Challenges/Halo: The Master Chief Collection

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 to spend on armor customization 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.

Challenges are reset every week on Wednesday at 10:00 am PST.

Challenge types
Accessible via the Challenge Hub in the "Options & Career" menu (or in the pause menu) in Halo: The Master Chief Collection, 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 can be unlocked for winning matches, performing kills with certain weapons/vehicles, earning Medals, and other similar tasks. Each week, 12 challenges (six rewarding  and six rewarding ) are made available from the list below, along with the "Peoples vs Peoples" challenge.

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. Each week, 12 challenges (six rewarding and six rewarding ) are made available from the list below, along with the "VS CPU" challenge.

Seasonal
Seasonal challenges, as their name suggests, are long-lasting challenges that take up an entire season.

Season 2: Spark
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.

Season 3: Recon
The following seasonal challenges can be unlocked in Season 3: Recon.

Season 4: Reclaimer
The following seasonal challenges can be unlocked in Season 4: Reclaimer.

Season 5: Anvil
The following seasonal challenges can be unlocked in Season 5: Anvil.

Season 6: Raven
The following seasonal challenges can be unlocked in Season 6: Raven.

Season 7: Elite
The following seasonal challenges can be unlocked in Season 7: Elite.

Season 8: Mythic
The following seasonal challenges can be unlocked in Season 8: Mythic.

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.

Haloween Celebration
These challenges were created during October of 2020 for the celebration of Halloween. The event launched on October 14 and ended on November 4.

Recon Slayer
This challenge was commenced on October 21, 2020, with anyone who reached the required level prior to the start of Season 4 getting the skin immediately upon its release. The challenge was included as a Seasonal challenge following the start of Season 4, and ended on November 25.