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