Follow Nicholai deeper underground.

Collect all weapons in the campaign.

Leave the clock tower plaza.

Defeat zombie Brad.

Defeat Nemesis on the rooftop.

Place all jewels in the clock tower monument.

Expand your inventory.

Craft an item.

Escape from Jill's apartment building.

Defeat Pesanta in Separate Ways.

Obtain all trophies.

Complete the main story using only knives and handguns. (Excluding specific battles.)

Complete the main story without talking to the Merchant once.