Halo 2 (MCC): The Arbiter Legendary No Skip No Glitch No Death without Headshot Weapons. 

This level might be actually the first level to be majorly impactful with this challenge (Well, It wouldn't if exceptions weren't made but we don't talk about that because. . .1 frame instant kills), I always run this level with a Carbine and Beam Rifle first thing and to not do that gives my body such a turn off. Still, I managed to get it done in . . .2 attempts.
Biggest question was how to kill enemies without my go-to. Yes Plasma Rifle Yes Energy Sword at the beginning but what comes after said beginning. Sentinel Beam turns out to be astounding for this. Nothing changed in the Banshee part. As usual and Fuel Rod Cannon turns out to be my "Beam Rifle" for this challenge. Which paid off well.