Did the achievement glitch on your account?
Did you start out on Super Soldier Difficulty?
Did the Veteran 3/7 achievement unlock?
Did you access the tutorial from a new game or through the menu?
Prior to campaign completion, did you replay missions through mission select?
If it didn't unlock initially, how did you finally get it to pop?
Haven't unlocked it yet. Just completed the campaign last night and upset to see (and receive) this glitch
Did you press the X button to skip cutscenes either at the end of a chapter or during a mission briefing?
A few times.