We are playing co-op campaign, locally on the same system with our individual gamertags logged in and player 2 received the ‘Game On’ (complete 50 missions or matches) achievement and then, an hour later, received the ‘I Got This’ (complete 100 missions or matches) achievement. Player 2 has completed 9 campaign missions, and that is it! No multiplayer has been played at all. We just like to play campaign. I (player 1) have completed 15 campaign missions, and that is it…no multiplayer played at all. 343i, this is getting ridiculous!