...Pretty sure Halo: Combat Evolved Anniversary had two speedrunning achievements. Finish The Silent Cartographer in 15(?) minutes on Legendary, and finish The Library on legendary in less then 30(?) minutes.
Also, if you count Halo 3's campaign achievements that you need to get certain scores on every mission. Most missions, getting the time boost would triple or double your score, and would be needed to win so you had to go fast also.
What they shouldn't do is, "Complete the campaign in one sitting in 4 hours or less", which I know they wouldn't, Halo usually has easy achievements, but they should through some challenging ones into the next game. I like those ones.