Here is the full list of all 10 Arena 54 - there are Visual Novel Action Adventure achievements.
Open the game.
Meet Akimon and hear his story.
Answer with the right question and beat King Un.
Answer with the right question and beat Cayclops.
Answer with the right question and beat Demon-Hunter.
Answer with the right question and beat Robo-Tek.
Answer with the right question and beat Woozy.
Answer with the right question and beat Komandor.
Answer with the right question and beat Doom Hammer.
Defeat all 7 fighters and win the crystal