Here is the full list of all 36 Unbound: Worlds Apart achievements.
Slay the Demon King
Find paradise
Harnessed every world
Cleanse the desert core
Become a master of everything
Step into the dark world
Discover the truth
Save every villager in the desert
Save all the villagers
Speak with both shady mages
Leap over a gate
Save every villager in the forest
Cleanse the forest core
Activate 30 waypoints
Save 30 villagers
Free the stern Guardian
Save 20 villagers
Enter the sand village
Enter the world of sand
Defy gravity to claim a powerful relic
Save 11 villagers
Talk with the family friend
Use strength to claim a powerful relic.
Meet the giant record keeper
Find a way to reach new heights
Find a way into the abandoned mine
Save 5 villagers
Meet with the old Guardian
Destroy the Eyrie
Use light to claim a powerful relic
Save a lost villager
Enter the sanctuary
Find the first map-maker
Awaken a forbidden power
Witness the beginning of the end
Talk with all the spirits