Here is the full list of all 28 Ivanoile Christalixeur Corruption achievements.
During eps 2, fail the QTE with Ivanoile
Go back to the orphenage during eps 4
During eps 1, lost the fight with the stranger
During eps 2, fail the attack with Ivanoile
A choice in episode 2
During eps 1, win the fight with the stranger with their Corruption at 100%
During eps 1, fail the Dodge event with Haley
During eps 3, fail the QTE with Iliana
During eps 2, fail the Hide event with Haley
Stay in game for 2 hours
Stay in game for 30 min
Stay in game for 1 hour
Complete eps 5 with an ending / Haley
During eps 2, Haley must go back to Ivanoile
Read the bonus story
Complete eps 5 with another ending / Ivanoile
A bonus achievement, cool?
Complete episode 4
During eps 4, fail the Dodge event with Haley
Complete episode 3
Complete episode 2
Complete episode 1
During eps 1, win the fight with the stranger
During eps 1, fail the QTE with Haley
Start the story
Check up the music room