For that achievement to trigger the party must have hit several things: 1. Fireteam of all clanmates. 2. All fireteam members must be displaying their clan tags. 3. No substitutions, no leaving the activity. A single , full playthrough. It appears that in all your previous playthroughs of the Raid not all of these requirements were met. No substitutions, no leaving the activity. A single , full playthrough.