In order to get certain achievements in the game, you need to finish a live event. If you did not put in the code after the event, that achievement is permanently locked. I personally am not a fan of this. I understand rewarding players for participating, but giving out miss-able achievements isn't fun. I will forever be locked out from 10 of the achievements because of this. I don't have an idea on what would replace achievements for live events, but achievements should not be miss-able like this.