Smelt an iron ingot.

Activate communication at the 5 military points.

Walk for 20 minutes without being damaged.

Blow up 2000 zombies using the rocket launcher or the grenade launcher.

Kill 500 zombies.

Blow up 500 zombies using the rocket launcher or the grenade launcher.

Survive your first horde.

Shoot zombies in the head 200 times.

Collect all types of ammo in a game.

Find the first ammo beacon.

Attack and destroy a monster.

Construct a furnace out of eight cobblestone blocks.