Halo Wars: Definitive Edition

This achievement will be obtained while working towards the Mr. Punctual achievement. While I could post here the 5 missions I think are the easiest to get par times on heroic, that is subjective and one that I find easy might not be easy for someone else. So in that case I suggest using the provided link to the Mr. Punctual achievement since you will need to get par time on heroic for every mission.

Achievement Tracking on this is also very buggy and neither this or Mr. Punctual have been patched. Keep an eye on the tracking after each mission that you complete with the par time icon showing up... and I guess if it doesn't go up "try try again"
Good luck to all and hopefully it works flawlessly for you