Call of Duty: Vanguard

Zombies Mode - Requires an online connection even if playing Private Solo matches!

Demonic Fountains are this Zombies' version of the perk machines from other games. As the description says, there are five of them, and you need to drink all five perks in a single game. Thankfully, unlock other Zombies games, the perks are all free in this one (the first drink from them is, anyway), so all you need to worry about for this achievement is actually getting access to all five Demonic Fountains.

This Zombies mode takes place in a hub world. Instead of doors like in other Zombies games where you needed to use points/money to open them, there are instead portals. You enter a portal, complete its objective, get returned to the hub world, and now that portal is gone and you have access to more of the hub world. This is what you'll need to do to reach all five Demonic Fountains in a single game.

Each Demonic Fountain is in its own part of the hub world, so in theory, you will need to reach Wave 6 (i.e. complete five portal objectives) to open up all areas of the hub world to reach all Demonic Fountains. However, this is necessarily required. The reason you may not need to progress this far is because portal objectives sometimes take place in parts of the hub world. If a portal takes places in a part of the hub world that also contains a Demonic Fountain, you can drink from it during the portal objective even if you don't have access to that part of the hub world yet. I'll come back to this after describing the locations of all fountains.

From the starting courtyard when you start a new game, there is a portal on the north wall, east wall, and southwest wall. The locations of the fountains are as follows:
 

1. Clear the southwest portal, and right behind it are stairs leading up to Fiendish Fortitude (Red), which is increased health.
2. After clearing the southwest portal, there is another portal further southwest at the entrance to an apartment building. Clear this portal to have access to Diabolical Damage (Yellow), which increases critical damage.
3. Clear the east portal from the starting location to get access to the Theater. Inside is the fountain for Aetherial Haste (Orange), which increases movement speed.
4. Clear the portal to the north from the starting location and you'll see the fountain just northwest of the opening, which is Venomous Vigor (blue) and improves health regen time.
5. After clearing the northern portal, there is another portal northwest from it, down a few stairs. Clear this portal to access the Boiler Room, which contains Demonic Frenzy (Green), which boosts reload speed.

Back to my point above about not necessarily needing to complete/clear all five portals to reach all fountains. You may, for example, interact with the northern portal to clear it to reach the Blue fountain, but the portal and its objective take place inside the Theater (which is normally accessed after clearinng the eastern portal). While inside the Theater and working on the portal objective, you can run over to the Orange fountain and drink from it, thereby eliminating the need to clear the eastern portal to reach the Theater (as far as this achievement is concerned), meaning one less Wave to survive. I have even had instances of, for example, interacting with the northern or eastern portal and having them take place in the apartments and just outside it, granting me access to the Red and Yellow fountains in a single portal, and eliminating two needed portals/waves to get all five fountains!

This is why I stated that you'll need to reach Wave 6 (clear five portals) at most to reach all five Demonic Fountains. If you pay attention to where you spawn in each portal, you can potentially reduce that number.