Pick up Frank's note after it's discarded

Open all safes

Upgrade and then break one of every melee weapon

Use bricks or bottles to lure an infected into attacking a human

Defeat Black Fang without getting hit

Win the brick throwing contest

Collect all comics

Find all training manuals

Fully upgrade a weapon

Leave Ellie hanging after a job well done

While in stealth, turn off the spotlight generator in Pittsburgh

Find a comic