Achievements
Complete each achievement to get the allotted gamerscore:
A perfectionist (100) - Collect 60 stars.
First blood (50) - Die for the very first time.
Getting started (100) - Collect 20 stars.
In my army now (50) - Turn 10 soldiers into zombies.
No leader is perfect (50) - Lose a zombie.
Non omnis moriar (50) - Turn a human into zombie.
Playing well (100) - Collect 40 stars.
Snowrunner (100) - Beat all winter levels with total time lower than 8 minutes.
Speedrunner (100) - Beat all summer levels with total time lower than 15 minutes.
Summertime (100) - Finish all summer levels.
Ultimate zombie leader (100) - Collect 90 stars.
Winter has come (100) - Finish all winter levels.