Here is the full list of all 15 A Pact With Me - there are BL Yaoi Visual Novel achievements.
Achieve Lucifer's Ending
Achieve Lucifer's Hidden CG
Fail All Three Pacts
Achieve Shilo's Good Ending1
Achieve Shilo's Good Ending2
Achieve Renan's Good Ending1
Achieve Renan's Good Ending2
Achieve Lior's Good Ending1
Achieve Lior's Good Ending2
Achieve Shilo's Bad Ending1
Achieve Shilo's Bad Ending2
Achieve Renan's Bad Ending1
Achieve Renan's Bad Ending2
Achieve Lior's Bad Ending1
Achieve Lior's Bad Ending2