Finish 4 substories.

Fully upgrade Kamiyama's truck.

Complete the four chapters of Part IV.

Collect 100 items in battle.

Cumulative point total from Hasegawa's directives hit 5,000.

Defeat each type of mutant variant.

Defeat 50 zombies with fire.

Shoot down an enemy projectile with a Heat Snipe.

Successfully Heat Snipe a gas tanker.

Land 100 head shots with Akiyama.

Clear a directive from Hasegawa.

Defeat 10 zombies using wield-able objects.