Call of Duty

You can obtain perk cans for your inventory. These can be exfilled as loot and taken into new games as well as crafted from schematics that you can extract from MWZ.

I obtained one can of nine different perks and a character with a large bag (9 slots) and took 9 different perk colas into the game and drunk them all straight away. Whole game with all the perks, smashing.

Update: Large bags can be purchased for 10k in red zone shop but I recommend looting lockers in the orange zone as I have quite good luck with those.

Update 2: This one's for the newer players, those that don't know every time you complete a Act story mission in game your character will drop a random perk power up. Not essential to the achievement just a useful tip.

MW3 - Perkaholic
Have 9 perks active at the same time in MWZ

Mode MWZ (MW3 zombies)
This achievement is relatively straight forward, simply start a game of MWZ and play till you have all 9 perks active at the same time. Now things get more complicated, you can get perks from many different ways including: Looting, story mission completion (1 random perk for the team per individual mission completion), contract completions and of curse perk vending machines. Thankfully you don't need to complete any EE or trust only the wunderfizz machines. I recommend you follow the video below for tons more information as this is more complex then what text allows. Hopefully you find the guide helpful.