Since nobody even plays Halo 5: Forge anymore, I can safely assume that one of the achievement is now unobtainable which is Community. This requires 7 other players to join. Sadly, nobody does this game anymore and it seems the achievement can no longer be unlocked. Sad tragedy.
no body knows about it and the people that do are mad because the game isnt what they want… the halo 5 beta was the peek of halo 5 + its not optimised for PC at all no 90 FOV or 120 FPS