Here is the full list of all 13 Deluge: Sermon for the Dead achievements.
Make it to school
Develop an interest for mineral mysteries
Reach Leiden University
Unlock Ina/Marisa's ending route
Unlock Rika's ending route
Unlock bad ending 1/5
Unlock bad ending 2/5
Unlock bad ending 3/5
Unlock bad ending 4/5
Unlock bad ending 5/5
Unlock RIka's ending
Unlock Ina's ending
Unlock Marisa's ending