Here is the full list of all 18 Hollowed achievements.
A life after death
Roaming the gods realm
Sinking deep
Meeting the god
Learning the motivation
Ringing the Bells
Choosing Oco
Saving Inna
Making a trade
Surviving the Collapse
Rejecting Life
Expressing aggression
Running from the past
Avoiding the seeking hands
Scaling the world
Seeing the future
Moving forward decisively
Creating a relationship