I just did
[STAGE 1][HEROIC 2] False History -> [STAGE 1] [HEROIC 4] Sharing the Blame -> [STAGE 1] Clean Bill of Health -> Interlude -> [STAGE 2] Landing Party
and I did not get the "Planted False Data in Tarlam Hall of Records" achievement. Have you done the bonus for [STAGE 1][HEROIC 2] False History?
Yes, we always do the bonuses just in case.