Here is the full list of all 9 Runeous: Part One achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
You've reached the very end that end could be!
Make Lene Unhappy
Embrace the fear!
Finish the Game
Make Col Unhappy
Unlock the power of thought
Meet a mysterious stranger
Encounter a monster and beat it!
Make Lene Happy