The December Update Title update for Gears of War 4 has 10 achievements worth 500 gamerscore.
Collect 5 Flaming Weapon Skins from Versus Special Events
Collect 5 Midnight Omen Weapon Skins from Horde Special Events
Beat the campaign on Inconceivable solo
Complete Campaign on Hardcore or higher without ever killing an enemy with a Lancer or Gnasher
Play 100 hours of Versus Multiplayer
Get 50 kills with every weapon in Versus, excluding grenades (Public Only)
Earn 1000 spotting or damage assists in Versus (Public Only)
Finish a Versus match on all 24 post-launch maps (Public only)
Kill 10 players without dying in a Versus Multiplayer match (Public only)
Own 10 Cards from the Series 3 Collection