Here is the full list of all 7 EdgeOfTheAbyssAwaken achievements.
Defeat the Soul Reaper for the first time
Defeat Cuban Crocodile for the first time
Defeat the creeping monster for the first time
Defeat Eye of the Abyss for the first time
Defeat Slayer for the first time
Defeat Manticore for the first time
Defeat Abyss Dragon for the first time