Here is the full list of all 8 Virtual Cottage achievements. It takes around 80-100 hours to unlock all of the achievements on Windows.
Wow. 100h hours already passed since you first set foot into the Cottage. We are proud of you.
You spent 5 minutes in your Virtual Cottage. Welcome and we hope you like it here.
You've made the commitment of studying for 30 minutes. Good job!
One hour passed already? How do you like it here so far?
Three hours in! Wow, you are pretty serious getting things done.
Eight hours passed! Maybe call it a day for now and relax a little?
You've studied for 24h in total. That is one full day of being productive. Nice work!
50h invested! Keep on rocking! :D