Here is the full list of all 42 BlackHoopS achievements.
Chose the other option in chapter Conflict.
Finish chapter Rockrat.
The route was inadvertently diverted in chapter Rocktat.
Kasa comes on stage.
Finish chapter Wineparty.
Changed the event in chapter Wineparty.
Finish chapter Conflict.
First time playing Threamls.
Meet Tholord.
Finish chapter Beginning.
Finish chapter Hesitation.
Finish chapter Hesitation, noticing the changes.
Finish chapter Symbol.
Finish chapter Castletop without going to the castle top.
Finish chapter Castletop.
Made things worse in chapter Castletop.
Things are out of control. Finish chapter Brother.
Finish the first half of chapter Extreme.
Finish the second half of chapter Extreme.
Finish chapter Hakkensend.
Finish chapter Guide
Finish chapter Actrossend
Reach the ending 1.
Reach the ending 2.
Reach the ending 3.
Reach the ending 4.
Reach the ending 5.
Reach the ending 6.
The first final ending.
The second final ending
The third final ending.
The fourth final ending.
Play Threamls with every regular customer in the tavern and win.(Including Nelson)
Collected all the keywords about the past.
Raise Wisdom to the highest level in one game round.
Raise Mentality to the highest level in one game round.
Raise Willpower to the highest level in one game round.
Wait for the time to run out at every story branch that includes a countdown, and complete a game.