Me and a clan mate have done the sparrow racing without dying closing the first door then getting the secret chest and it still doesn't pop. We have gone till the next area and it still doesn't come up. We do not know what else to do.
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The only way i have got this triumph to work is by getting the secret chest. 1 person gets to the safe spot outside the chest room and moves close enough to see the chest appear. All other fireteam members go though the hole in the wall climb up the the ledge. Once all remaining fireteam members get to the top of the ledge. Everyone runs in at the same time and the triumph pops once the chest is open.