Immortal is an achievement that can be unlocked on the PC version of Plants vs. Zombies. It requires the player to survive 20 waves of Survival: Endless. Once the player has survived 20 waves of Survival: Endless and selected their plants for the next wave, the player will then have the achievement completed. It would not be awarded until he or she begins the next wave.
- For strategies, see Survival: Endless/Strategies.
Almost every properly designed setup can make it through 20 flags of Survival: Endless, as the waves only start to become really huge when the player reaches 30 flags or more, especially after 32 flags.
- The icon is a flag with the number 20 on the top left corner, representing the 20 waves.
- It can also be earned by accessing and surviving for 20 waves in other Survival: Endless games on the Limbo Page.
- It is an easier version of Alive and Planting, as the player does not have to survive that long in Survival: Endless, with 20 less waves to survive (or about half).