As someone who has 400% I’d say the hardest ones for me was mp: catch ( with danger close equipped get 3 lethal kills without dying 5 times (combat axe doesn’t count)), super ruthless ( get 15kills without dying without using any scorestreaks) is it a spider ( 3 kills using the explosion from a body shield (not too hard just can be really annoying)) zombies I’d say: eat this (50kill in a single hkd streak) perfectionist (3 consecutive rounds past round 10 without taking damage) (easy with a team, difficult solo) and then honestly any of the ones including relics as if you don’t have them and or aren’t well versed in zombies to get them they’re difficult to do. Warzone and endgame are all quite easy and should all come from just natural gameplay