Here is the full list of all 16 LAST CHICK - there are 最後のひよこ achievements.
Hit a giant egg on a zombie
Kill zombies for the first time
Fall down a zombie with a headshot
Eaten by zombies
Rescue the chick for the first time in rescue mode
Rescue 20 or more chicks in one play in rescue mode
Rescue 30 or more chicks in one play in rescue mode
Rescue 40 or more chicks in one play in rescue mode
Get to the goal without losing any chick in escape mode
Reach the goal within 8:30 in escape mode
Reach the goal within 6:00 in escape mode
Reach the goal within 4:30 in escape mode
Take the eggs inside the church in defense mode
Survive more than 6 minutes in defense mode
Survive more than 9 minutes in defense mode
Survive more than 12 minutes in defense mode