Kill your first zombie.

Reach 0:30 without the house taking a hit.

Reach wave 3.

Reach wave 8.

Kill 25 common zombies.

Kill 25 runners.

Kill a brute.

Kill 25 brutes.

Kill 25 gym girls.

Kill 25 spitters.

Kill 25 teachers.

Kill 25 helmeted zombies.

Knock off 20 hard hats in a single run.

Kill 25 bloaters.

Kill 5 zombies with a bloater's burst.

Defeat a boss.

Kill 8 zombies with a single cursor pulse.

Kill 100 zombies in a single run.

Kill 1000 zombies in total.

Buy your first survivor.

Have all 8 survivors.

Surround the house with all 20 stretches of wire.

Set all 12 bear traps.

Kill 3 zombies with a single shell.

Bury all 12 mines.

Build all 8 stretches of barricade.

Kill 30 zombies with a single airstrike.

Hold 500 coins at once.

Buy at least one level of every upgrade.