So if you're an idiot like me...you played only aether maps solo with the same perks, same elixirs, same guns and didn't put operator mods on any of you weapons all the way up to Prestige Master 1000. Then this guide is for you. I'm going to cover the best strategies (that I know of) to complete the challenges that are don't come naturally to every player.
Zombie Hunter Challenges
I did all of these without any extra effort with the exception of the catalyst challenges.
Curiosity - Kill 1,000 Catalyst Zombies
More Than One Way - Kill 250 Catalyst Zombies using the corresponding reactive AAT's
...Got Your Tongue - Deny 500 Catalyst Zombie Transformations
The easiest way to do this is to do the purge the blight step on IX. Prior to teleporting put cryofreze on all of your weapons. The step spawns endless gas catalyst that will remain at the same level (I can normally do this by round 20). Blow up the first orange egg sack and it will force the zombies to spawn on the 2nd level. Stand on level one and let them come to you. Once you have all 1000 catalyst kills, move closer to their spawn and You can do these challenges in one game if you have any elxirs that can spawn ammo (cache back or alchemical). Easy clap.
Zombie Survivalist Challenges
All of these challenges were pretty straight forward. If you are struggling with the open sesame challenge you should just break your copy of BO4 in half and call it a day.
Open Sesame - Open 200 Doors
Zombie Strategist Challenges
This one was rough since I rarely if ever played chaos maps. Best recommendation would be to just play IX. The base maps tend to have the worst players. I guess its just that the folks tend to not be that invested in the game. I would also recommend equipping the "Nowhere but there" elixir as you can double your effors for the EMT challenge.
Resurrectionist - Revive 100 Players with the Scepter
Elixirs and Talismans Challenges
Ace Up My Sleeve - Spawn 80 powerups by using Elixirs
Rather than wasting your valuable elixirs. Use the point drop elixir. Its cool down is only 5 seconds and you keep your points.
Share The Wealth - Use Point Drops to give points to another player in 20 matches
This one is a pain in the ass. Only one drop per match counts towards your progress. Just make sure you have this on elixir equipped in public matches.
Sanctuary - Avoid damage from 80 traps using Anti-Entrapment
Each unique trap count one time per game. I would recommend doing the on Alpha Omega. There are 4 traps accessible after opening 5 doors (a 5th if you are feeling saucy).
Weapons and Equipment Challenges
Storm Of The Sentry - Kill 500 Zombies with Sentries
Front Toward Enemy - Kill 500 Zombies with Claymores
I mean, once you go wraith fire, you never retire...Run in IX spawn with equipmint elixir and cache back if you can spare it. I would also recommend the talisman that makes sentry only consume 50% of the specialist charge.
FOR THE LOVE OF GOD PUT THE OPERATOR MODS ON YOUR GUNS! Each mod category takes 10K kills, so don't waste your time by waiting.
Death Slider - Get 500 Kills using the PhD Slider Explosions
Alright so I might sound like a broken record training in the IX spawn room. Use the talisman to spawn with a perk and put PHD slider in that slot so you can get kills early. PHD Slider is only effective until round 13.