Here is the full list of all 27 The Little Acre achievements. It takes around 2-3 hours to unlock all of the achievements on Windows.
Found Arthur
Ok, we get it
Only placed the orb once
Overcome hurdles at the dam
Attacked the swamp monster in less than 5 seconds
Made a new friend
Ruined lunch
Ask for a solution
Didn't ask for any solutions
Helped Merr fix a machine and return home
Tried to lose the cavity magnetron
Saved Aidan
Gave Merr wanted he wanted… sort of
Where did you get that pattern?
Didn't ask for any hints
Distracted Dougal once only
Beat the game in less than 1 hour
Complete The Little Acre
Solved the dance puzzle on your 1st try
Apparently you’re ready for this jelly
Travelled to Clonfira as Lily
Took out the informant
Travelled to Clonfira as Aidan
Make breakfast
Let Dougal take the blame
Got the generator working
Get dressed without waking Lily