Here is the full list of all 17 Abyss Odyssey achievements.
Defeat the Warlock.
Uncover the Warlock's secret.
Defeat Verbum Dei.
Defeat Paganini, the Demon Violinist.
Defeat the Golem.
Defeat the shopkeeper.
Capture a level 10 enemy.
Finish the prologue.
Defeat the Living Creature.
Unlock the Pincoya.
Capture a level 25 enemy.
Capture a level 40 enemy.
Equip Katrien with 3 fully upgraded special attacks.
Equip the Ghost Monk with 3 fully upgraded special attacks.
Equip the Pincoya with 3 fully upgraded special attacks.
Defeat the Warlock in nightmare difficulty, "Coop Friendly Fire" must be on.
Win 5 online versus matches in one session.