I, Zombie
12 Achievements
1,000
2-3h
Xbox One
Xbox Series
Getting started
Collect 20 stars
100
48.58%
How to unlock the Getting started achievement in I, Zombie - Definitive Guide
All you need to do is get 1 star on all of the summer levels, thus just at least pass all the levels, but it is recommended to go for 3 stars because you will have to for the 90-star achievement.
See Ultimate Zombie Leader .
Refer to “Ultimate zombie leader” for more information.