Treyarch always makes the campaigns harder than Infinity Wars did. I have every single achievement for COD 4, Modern Warfare 2 and Modern Warfare 3. I gave up about 6 missions in for WaW on Veteran. I got Platinum Trophy for Black Ops on PS3 after about 7 months. I have all achievements for Black Ops 2 that only involve beating the game, some misc stuff too. That's it. No veteran. No zombies. Treyarch makes it very frustrating when it comes to having 100% completion with achievements/trophies.
"I swear, I'm so pissed off at my mom. As soon as she's of age, I'm putting her in a home." ~ Brennan Huff