Here is the full list of all 57 Zombie Hunter achievements.
Reach 25 kills.
Reach 50 kills.
Reach 100 kills.
Reach 500 kills.
Reach 25 headshots.
Reach 50 headshots.
Reach 100 headshots.
Reach 500 headshots.
Buy your first weapon.
Buy 10 different weapons.
Upgrade your weapon for the first time.
Upgrade 15 time your weapons.
Unlocked region 2.
Unlocked region 3.
Unlocked region 4.
Unlocked region 5.
Kill 4 zombies on strike.
Reach 50 kills with sniper.
Reach 50 kills with pistol.
Reach 50 kills with automatic.
Reach 50 kills with bow.
Reach 50 kills with bazooka.
Use 10 Spankys.
Use 10 dogs.
Use 10 radars.
Use 10 hollow bullets.
Kill a civilian "by error".
Open a mistery box.
Lost a match.
Kill all the super zombies.
Complete a perfect match.
Completa 25 perfect matchs.
Complete all the missions of region 1.
Complete all the missions of region 2.
Complete all the missions of region 3.
Complete all the missions of region 4.
Complete all the missions of region 5.
Kill 10 zombies on strike.
Kill Dr. Muscle.
Kill Kyofu.
Kill Redspike.
Kill Zelvis.
Kill Splithead.
Kill Bubbles.
Kill 1000 Prickles.
Kill Zordor The Clown.
Complete all the missions.
Kill Zrim Reaper.
Kill Sergeant Z.
Kill Captain Trout.
Kill LordNight
Kill The Twins.
Kill Headless Walker.
Kill Fat.
Kill Silent Freezer.
Kill DeathKiss.
Kill Maniatic