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