Just seen the halo nameplate ugly christmas sweater is out. it says 2 campaign missions in snowy conditions need to be beat or 10 multiplayer matches. Which pvp maps is it, or is it a playlist?
From the announcement:
Complete (without quitting) 10 matchmaking (PvP and/or Firefight) matches on snowy maps.
Sword Base (Halo: Reach)
Solitary (Halo: Reach)
Glacier (Halo: Reach)
Or, beat the par score on any two snowy campaign missions.
ONI Sword Base (Halo: Reach)
The Package (Halo: Reach)
If you have MCC on Xbox then you have more games than just Reach which means there are more options included (for both Campaign and MP maps). This Message was specifically for PC, which currently only has Reach.