Hallucination Nation is an achievement featured in Call of Duty: Infinite Warfare on the zombies map Rave in the Redwoods. It requires the player to stay in the Rave Vision area of the map for 5 minutes after the player reaches scene 10.
There are two ways of unlocking this achievement. The first method is when the player enters Rave Mode, the player must keep interacting with the fairies around the map until the player has been in Rave Mode for five minutes straight.
The second way to achieve this is by completing most of the map's main easter egg until the player is at the first part of the boss fight, which takes place in Rave Mode. Surviving for five minutes like this will also grant the player the achievement.