Here is the full list of all 31 RiME achievements. It takes around 12-15 hours to unlock all of the achievements on Windows.
Accept things as they are.
Hit your lowest point.
Pay it forward.
From victim to victor.
Leave your comfort zone.
Collect all the toys.
Collect all the outfits.
Complete the lost lullaby.
Peek through all the keyholes.
Reassemble all the emblems.
Reunite with the white shade.
Respect the past.
Break the five strange statues.
Break lots of jars.
Lit many lights.
Bring light to the labyrinth of darkness.
Try to wake up the lost Sentinel.
Reunite the family.
The higher, the funnier!
Throw something as far as you can.
Don't smash the eggs.
Complete the labyrinth without making a sound.
Find the shark.
Use only one bubble in the underwater cave.
Find a nice resting place.
Try to undo a mistake.
Move undetected amongst the shades.
Witness the resting place of the once mighty.
The other way was safer.
Turning your back to the truth and persevering will lead you nowhere.
Be faster than the Sentinels.