The Raids Introduction card was bugged when The Dark Below launched, and wasn't counting Crota's End completions. This was fixed a while ago, but any completions you had of Crota before the patch did not get added into the card. From Siffow's notes: [spoiler]-Raids Introduction are only counting VoG completions. As of 1.1.1 the card will start counting Crota completions, but not retroactively. Completions after the 1.1.1 patch was applied will count.[/spoiler]