Steam - Halo MCC - Halo Reach - Campaign
Me and 2 other people went through the entirety of the Halo Reach Campaign and undertook the challenge of completing every mission on legendary difficulty in under 3 hours. We did it in 2 Hours, 27 Minutes, and 11 seconds. However, only the host received the achievement “Keep your foot on the pedrogas” and also the emblem that is unlocked upon the achievement. Me and the other participant did not get any of those things listed. All I am asking for is the achievement unlock and the emblem unlock. I am unsure if this could be an issue with steam with having to get the achievement in order to unlock the emblem or not. If you need any proof either check my stats somehow, or I could send you a screenshot of my stats.
Sometimes the achievements may not pop, but according to your service record, you unlocked it.