Use the Upgrade Menu to acquire an Upgrade.

Reach "The Dark Lord" ending.

Play 3 quests with a friend (Campaign only).

Completed "Visiting Rich People"

Discover Blade of the Darkmoon covenant.

Acquire the Rite of Kindling.

Defeat the Soul Lord Bed of Chaos.

Completed "A Trip to the Country"

Completed "Better Get Used to It"

Completed "Sarah"

Won the race

Found a Pulp Magazine

Found a 'Gangsters of the United States' cigarette card