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