Never ending backlog...
Halo 2: Activate Terminal 9 on Quarantine Zone. - Halo: The Master Chief Collection
Collect 3,000 campaign or playlist medals. - Halo: The Master Chief Collection
Halo 3: Complete Floodgate. - Halo: The Master Chief Collection
3,118/25,5181,285/7,000172/700
1,800/1,8001,000/1,00020/20
1,754/1,7541,000/1,00022/22