Risk of Rain 2 – How to Unlock The Mercenary Character
Complete the True Respite achievement by obliterating yourself at the Obelisk.
To complete this achievement you must clear stages until you reach your beginning again in order to spawn the celestial portal in a single run. You must effectively beat the game.
To do this simply continue to clear stages without dying until you return to your first map, whereupon celestial portals will begin to spawn.
Go through a celestial portal and drop down the jump puzzle until you reach a large obelisk. Interact with the obelisk to eradicate yourself and end your run, “beating” the game and unlocking the character.
If unsure which portal to use, the portal will be announced in the ingame chat as a celestial portal, and looks like a white portal compared to its vibrantly blue portal counterpart which leads to the Bizarre.