Here is the full list of all 10 Abyssal Agent Alyss achievements.
Beat the first boss
Get rescued from captivity by Sylphy
Beat the 2nd boss
Defeat the final boss Adonis
Put yourself in the wall even knowing what happens.
Lose to the succubus sisters.
Lose to Abazel.
Lose to Annette
Lose to Adonis
Watch over Annettes end...