Defeated every worthy opponent.
Note: All bossfights shown in the video have been played on easy difficulty with maxed out characters for demonstrations purpose. You may also play on easy, it has no effect on the trophy / achievement! It's highly recommended to max out your characters first! All shown bossfights are real time and have been absolved with a 5 star rating.

There are 4 'worthy opponents' and they are all in archylte steppe. First of all, you will have to find all kaktorus statues in this area. Simply take a look on my ingame map that is shown in the beginning of the video (red symbols). Some statues require specific weather conditions.
After finding all of them you unlock new quests in the hunter's camp. Those quests are needed to make the monsters spawn (except Long Gui, he isn't linked to a quest).

TACTICS:

#1 Ochu
- Simply keep attacking him with ravagers, no big deal
- RAV-RAV-RAV Paradigm

#2 Immortal
- Keep attacking with ravagers. Once staggered, push up his damage and attack with commando. Make use of your ultra attack (Metor Javelin). Still not that hard.
- RAV-RAV-RAV & COM-COM-COM Paradigm

#3 Yomi
- The hardest out of those 4 enemies.
- You will do most damage with Poison (requires Saboteur to cast)
- If you have a monster that can cast Bravega and Faithga, then use it instead of a healer! Those abilities will drastically increase the damage you cause.
- During the parts where Yomi is invincible you should heal your team and cast Bravega and Faithga.
- When Yomi can be attacked cast spells (inlcuding poison) with Saboteur/s, then switch to RAV-RAV-RAV to stagger and again switch to COM-COM-COM to cause heavy damage (use ultra attack Meteor Javelin)
- RAV-RAV-RAV, COM-COM-COM, MED-MED-MED, SAB-SAB-RAV, SYN-SAB-RAV

#4 Long Gui
- Attack both legs with RAV-RAV-RAV, once staggered push up the damage and switch to COM-COM-COM
- After the health bar of both legs has depleted, Long Gui will fall to the ground and can't attack you. He's a very easy target then.
- Cast Poison and other negative effects with Saboteur/s. Push up his damage to 999,9% and keep attacking with COM-COM-COM
- Heal your team whenever it is needed
- RAV-RAV-RAV, COM-COM-COM, MED-MED-MED, SYN-SAB-RAV

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