Have 100,000 gold

Find all text collectibles

Climb at least 8848 meters on various objects.

Find Camden

Kill 100 enemies by kicking them off the rooftops/cliffs.

Catch 25 enemies in the Electric Fence trap

Catch 5 Bolters

Kill 25 enemies using Ground Pound or Drop Attack

Save 15 survivors from zombies

Complete 5 quests in a single co-op game with the same 3 partners

Use Blueprints at least 100 times

Show the outside world that you're still alive