Call of Duty Black OPS Cold War guide how to unlock all black ops in multiplayer and zombies

The new Call of Duty Black OPS Cold War is rather rich in challenges of all kinds, whether for online multiplayer modes, different zombie modes or for the campaign to live solo. If you pay attention to the challenges that the game offers, you will notice a "secret operations" section in the menus where all the challenges are locked under a padlock with the mention "top secret". If you are looking to know how you can unlock all covert ops for multiplayer or zombie in Call of Duty Black OPS Cold War, we suggest you find a quick guide below that will reveal all the conditions you will have to meet to unlock them in your game. 

How to complete all Call of Duty Black OPS Cold War top secret / covert ops challenges:

Each time you successfully complete the secret operation challenge, you will unlock a player banner that you can equip at any time from the game menus. Find below all the conditions that you will have to meet during your games to unlock all those top secret challenges in the game.

All Unlockable Secret Ops in Multiplayer Mode:

1. Relentless Killer – You must earn 10 “Relentless” medals by getting 20 kills without dying in multiplayer matches.
2. Brutal Killer – You must earn a “Brutal” medal by getting 25 kills without dying in a multiplayer match.
3. Nuclear Killer – You must earn a “Nuclear” medal which is obtained by achieving 30 kills without dying.
4. Frenzied Slayer – You will need to earn a Slay Medal by getting 5 quick kills in a multiplayer match.
5. Mega Slayer – Get a “Massacre” medal by getting 6 quick kills in multiplayer.
6. Ultra Slayer – You will need to get an Extermination medal in a multiplayer game by getting 7 quick kills.
7. Chain Killer – You will need to successfully complete a chain of kills of 7 players quickly in multiplayer.
8. From the Deep – In Multiplayer, get 25 kills against enemies on land or on a ship when shooting them underwater with a primary or secondary weapon.
9. The Eraser – In a Bomb Assault Team multiplayer match, single-handedly take out a team of four players.
10. Return to Sender – Return a Frag Grenade and eliminate the enemy who threw it at you.
11. Underwater Operation – Underwater, place C4 on an enemy occupied gunboat and detonate it to kill the occupants 5 times
12. Nuclear Wish – Earn a Nuclear Medal by getting all kills with the same weapon.

All Unlockable Secret Ops in Zombies Mode:

1. Reaper of the Undead – Successfully kill over 1 million zombies (all games combined).
2. Armed to the Teeth – Get 2 weapons with the heck of a punch at max level, ammo mods equipped, and 6 perks activated.
3. Social Distancing – Reach round 20 without being hit once by zombies.
4. The Anvil – Exfiltrate using only melee attacks.
5. One more ? – Reach round 100 in a Die Maschine/unlimited game.
6. Sufficient – ​​Reach round 20 equipped with only your starting gear and no upgrades.
7. Invincible – You will need to reach round 30 without being knocked down once.
8. Checkmate – In Die Maschine, you will have to play all the trials in a single game.
9. Messenger of Chaos – You will have to successfully eliminate 50 enemies with a single support.
10. Mystery Box Addict – You must purchase all Mystery Box weapons in a single game.
11. Liberation from Evil – In Die Maschine, simply complete the main quest.
12. King of the Silverbacks – You must have a score of 999,999,999 points in all games combined in Dead OPS Arcade mode.