Kill a 343 developer in matchmaking or someone who has this achievement. - Halo: The Master Chief Collection
Play a multiplayer or co-op game at least 3 months after your first game. - Halo: The Master Chief Collection
Halo: Reach: Complete ONI: Sword Base. - Halo: The Master Chief Collection
124/25,51880/7,00010/700
364/3,270285/1,25025/73
321/2,459255/1,00013/50