Here is the full list of all 7 Remnants Of Isolation achievements.
Keep the promise to Celesta.
Hone your powers to unmatched levels.
Seal away the castle at the cost of eternal loneliness.
Through the sacrifice of your partner, you can finally walk free.
Command the power of all elements.
Leave the castle hand in hand under 1:30 hours.
Uncover all traces of humanity that once walked these nightmarish halls.