Here is the full list of all 19 Blue Rose achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Read mini story 5
Read mini story 4
Completed Erin route
Completed all endings
Completed Aran route
Completed Tobias route
Read mini story 3
Read mini story 2
Read mini story 1
Completed Gavin route
Reached a Bad ending
Completed Simon route
Reached a Good ending
Defeated the dragon
Took part in the festival celebration
Was reminded of the old fairytale
Uncovered Adale's treachery
Was reunited with Simon
Found the town hidden in the mountains