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