I’ve been doing the legendary speedrun for this level in Reach and I’ve completed it 3 times already but ingame it says I haven’t completed it yet, I aslo don’t have the achievement for completeing it or getting the par score/time ect…
the only thing that I can say is that I reverted to last checkpoint allot when performing the last 2 concussion rifle jumps @ the end of the level.
https://www.youtube.com/watch?v=4hgsqfApk64
@ 6:50, 9:45
so I don’t know if reverting to last checkpoint to much will bug your progression for this level.