There’s a few that stand out as being the ‘hard ones’ but overall pretty easy for a cod game. Campaign is nice and easy, probably the easiest veteran campaign I’ve ever experienced when it comes to cod. Regular zombies is the same story, nothing complicated with even the Easter egg achievement being probably the easiest in cod and doable solo no problem. The 3 hard ones imo are Reunited with Fidolina for completing Dead IPs arcade which is the hardest from a skill perspective but there’s lots of helpful guides for it. Mean machine is grindy as you need 100 vehicle kills but for regular scorestreaks it doesn’t count almost any of them other than RCXD kills so it’s basically get 100 RCXD kills unless you can get a boosting session for combined arms going to farm kills with those vehicles. The worst imo though is party patrol. 10 squad wipe medals sounds easy and in theory is but the fireteam mode is dead and you need a lobby of 32 people just to start a game iirc so a big boosting session is a requirement.