Here is the full list of all 16 PLANET ALPHA achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
It was never meant to happen
Like a big family
Another time another opportunity
Don't fight the flow
Can't compete with the trees
What lies beyond
Resting by the pond
Collecting the first artifact
Collecting the fourth artifact
Curiosity is key
Collecting the third artifact
Collecting the second artifact
Downwards is the new upwards
Slipping through the cracks
Falling is not an option
How did they get it up there