...To Be Left Alone

...To Be Left Alone is a challenge in Risk of Rain 2.

It unlocks the character Acrid, added in the Hidden Realms update. This challenge is completed by leaving the Bazaar Between Time through the Null Portal below the Blue Portal, then completing the 9-wave challenge presented for the player.

Trivia
The name of this challenge refers to the ending quote from Risk of Rain when completing the game as Acrid. The entire quote is "...and so it left, with a new hunger: to be left alone."