Here is the full list of all 22 Runo achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Watch through the credits
Finish the game
You forgave your partner
Play the kantele 50 times
Exhaust all Great Oak dialogue options
Näkki pulls you under three times
Get to Alinen
Take a seat on the rocking chair
Throw a dart
Jump on the sauna roof
Collect all journal entries
Flick cottage light switches 10 times
Take a picture with your phone
Throw the stick into the lake
Pick five melancholic dialogue options in dreams
Tell dad to drink some water
Drink beer in sauna 10 times
Jump 50 times
Get all three kantele melodies right on the first try
Fail kantele melody three times
You thought it was best to go your own way
You were sorry for what you did