Here is the full list of all 20 Wanna Survive achievements.
Kill 1 zombie by pushing a unit
Kill 4 zombies with a single shot
Kill 4 units with a single explosion
Kill 8 units with a single explosion
Kill 3 units by knocking back an explosive unit
Kill 2 zombies with a single spear attack
Reach North City
Have all characters join your party
Have all characters reach the end
Complete Man's storyline
Complete Doc's storyline
Complete Father's storyline
Complete Kid's storyline
Complete Boxer's storyline
Complete Dog's storyline
Complete Gramps' storyline
Complete Girl's storyline
Complete all stages in the game
Complete all stages without taking any damage
Leave the Store with nothing unsearched