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
Completed Erin route
Completed all endings
Read mini story 4
Completed Aran route
Completed Tobias route
Read mini story 3
Completed Gavin route
Reached a Bad ending
Read mini story 2
Read mini story 1
Reached a Good ending
Completed Simon route
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