Reach the caves.
Defeated your first enemy.
Do the farmer a favour.
Score a goal.
You shall henceforth be known as "The Common Cold".
Neutralize 3 or more enemies with a single throwable.
Fully upgrade Harper and become an honourary Northerner.
Unlock all throwables.
Successfully escape the Tripod.
Reach the sewer.
Wash up on the beach.
Complete the game.
