Return Maxwell's book to Whistles

"Let go of him, and you let go of all."

Kill 15 walkers with the uzi

Find the maps in the Labaratory.

Complete the YAMANTAU level.

In multiplayer, start a dance party with your friends.

Find a tune on the radio.

Melee-kill or stun 50 enemies.

Spend 500 consumable resources on crafting.

Get into the Trolley.

Install a modification of each category on a single weapon.

Kill 15 walkers using the sap gloves