If you completed it with a 6-man group, your clan only displays 4 members.
Also if you are playing xbox one, the achievements are buggy, it can take up to a day for them to pop, logging out and in to destiny with the character you completed the raid on, or performing a hard reset may force the achievement pop.
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I completed it with 2 people him and I he got it but I did not.
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Then it could possibly be the xbox ones buggy achievements, give it time and it should unlock