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