Complete the indicated task to unlock the achievement.

Achievement	How to unlock
Chapter1	Pass "Chapter1".
Chapter2	Pass "Chapter2"
Chapter3	Pass "Chapter3"
Chapter4	Pass "Chapter4"
Chapter5	Pass "Chapter5"
Chapter6	Pass "Chapter6".
Chapter7	Pass "Chapter7".
Chapter8	Pass "Chapter8".
Chapter9	Pass "Chapter9".
Getting ready!	Be ready to join the battle and start a new game.
Thank you!	Have a quick look at the credits.
WarOver	Finish the entire campaign.
Zombie20	Reach wave 20 while playing the zombie mode.
Zombie5	Reach wave 5 while playing the zombie mode.