Here is the full list of all 66 Zombie Spree: The Dawn achievements.
You killed your first 1000 zombies.
You killed 5000 zombies.
You killed 10000 zombies.
You killed 20000 zombies.
You killed 50000 zombies.
You survived Treeland Dusk.
You survived Dark Tunnel.
You survived Quiet Town.
You survived Quarantine Failure.
You reached 5000 high score points.
You reached 10000 high score points.
You reached 15000 high score points.
You reached 20000 high score points.
You reached 30000 high score points.
You've dealt 15000 damage using heavy machine gun.
You've dealt 50000 damage using heavy machine gun.
You've dealt 100000 damage using heavy machine gun.
You've dealt 15000 damage using minigun.
You've dealt 50000 damage using minigun.
You've dealt 100000 damage using minigun.
You've dealt 15000 damage using sniper rifle.
You've dealt 50000 damage using sniper rifle.
You've dealt 100000 damage using sniper rifle.
You've dealt 15000 damage using flamethrower.
You've dealt 50000 damage using flamethrower.
You've dealt 100000 damage using flamethrower.
You've dealt 15000 damage with RPG.
You've dealt 50000 damage with RPG.
You've dealt 100000 damage with RPG.
You've dealt 15000 damage with Artillery Strike.
You've dealt 50000 damage with Artillery Strike.
You've dealt 100000 damage with Artillery Strike.
You've dealt 15000 damage with Sniper Team.
You've dealt 50000 damage with Sniper Team.
You've dealt 100000 damage with Sniper Team.
You've dealt 15000 damage with Flame Rounds.
You've dealt 50000 damage with Flame Rounds.
You've dealt 100000 damage with Flame Rounds.
You've dealt 15000 damage with Helicopter Support.
You've dealt 50000 damage with Helicopter Support.
You've dealt 100000 damage with Helicopter Support.
You've dealt 15000 damage with Mines Drop.
You've dealt 50000 damage with Mines Drop.
You've dealt 100000 damage with Mines Drop.
You've dealt 15000 damage with Impact Explosives.
You've dealt 50000 damage with Impact Explosives.
You've dealt 100000 damage with Impact Explosives.
You've dealt 15000 damage with Steady Explosives.
You've dealt 50000 damage with Steady Explosives.
You've dealt 100000 damage with Steady Explosives.
You've dealt 15000 damage with Guided Missile.
You've dealt 50000 damage with Guided Missile.
You've dealt 100000 damage with Guided Missile.
You've dealt 15000 damage with Auto-Turret.
You've dealt 50000 damage with Auto-Turret.
You've dealt 100000 damage with Auto-Turret.
You've dealt 15000 damage with Fire Pickup.
You've dealt 50000 damage with Fire Pickup.
You've dealt 100000 damage with Fire Pickup.
You've dealt 15000 damage with Nuke Pickup.
You've dealt 50000 damage with Nuke Pickup.
You've dealt 100000 damage with Nuke Pickup.
You survived Office Nightmare.
You survived Ruined City.
You survived Rusty Docks.
You survived Creepy Basement.