To get this, you must beat campaign on any difficulty. The difficulties are Recruit, Regular, Hardened, and Veteran. For this achievement, You can simply beat the campaign on Recruit in 3-4 hours if youre decent. I beat it on Regular I have some things to say about the final mission
*** Spoiler - click to reveal ***in the final mission after getting to Hassan you get the missile that is about to hit Washington D.C But you’re gunless and got to make stuff with items around you just like Alone also you’ve got to disarm the missile while hiding from them I did this easily by running to the bathroom in the back of the floor crawling in the crawl space to the other one and finishing the defusing but after that you have to kill Hassan and his men I did this by making a smoke grenade by grabbing chemicals and bottles and make the glass shiv by either making hassans men shoot the glass panels or breaking them yourself and some tape and getting take downs then after you kill his men you get into this cutscene cutting to ghost with a sniper and shooting and killing Hassan ending MWII
Also side tangent It felt like it was only this game but I’d just die the most stupidest ways or just die to quickly I usually go gun ho and shoot and push but this game with armored enemies and these shotguns that somehow one tap you but shoots confetti at the enemies it just felt unfair but it could just be a skill issue and I just suck but some other people felt the same way and I would really like to know if y’all felt this aswell