Here is the full list of all 21 Zombie Gotchi achievements.
You have gotten a Girl!
Do you remember?
Delicious!
Let's battle!
Best Hair Ever!
I can see living People!
You survived the Tutorial!
You have gotten a Boy!
Didn't liked your Zombie?
It will survive you!
Still no sign of life!
Yay, Zombies get ill?
They looking friendly!
There is something in there!
Happy Happy Happy!
Looks like your Brain next!
Yummy, Bunny!
Did you hit?
Coming Home!
Did i meant "Alive"?
Snack Bubble!