This method was not discovered by me im simply sharing and
Im not aware of this being posted already. ENJOY!
1. Go into "Properties..." on Halo MCC
2. Click "SET LAUNCH OPTIONS..."
3. Type "-eac-nop-loaded" and hit "OK"
4. Launch the game in mod mode and enjoy unlocking
achievements, you can use my trainer here to help you unlock them
- https://www.mpgh.net/forum/showthrea...0#post14864250