Here is the full list of all 27 Cyber Girl - there are Zombie Hentai achievements.
Open scene 1
Open scene 2
Open scene 3
Open stage 4
Open stage 5
Open stage 6
Open stage 7
Open stage 8
Complete all levels
Kill 20 zombies
Kill 40 zombies
Kill 60 zombies
Kill 80 zombies
Kill 100 zombies
Kill 5 bosses
Kill 10 bosses
Kill 15 bosses
Kill 20 bosses
Collect 1000 coins
Collect 2000 coins
Collect 3000 coins
Collect 5000 Coins
Buy a sub-machine gun
Buy a Shotgun
Buy assault rifle
Buy revolver
Buy a katana