Final Fantasy XIII

For this achievement, you will have to complete missions 35-51 All of these missions can be found in The Faultwarrens, and are fairly linear. You'll have to run the trials seven times to finish all the missions. This image might help when doing the trials.

Once you have done mission 35-50, a final challenge will open up in area D3; mission 51. Beat the mission and you'll unlock the achievement.

Mission 51: Attacus
HP: 9,135,000

This is one long, drawn out fight. Probably the best party to use here would be Fang (leader), Hope and Snow. Use the following paradigms.

Premeditation
• Fang: Saboteur
• Hope: Synergist
• Snow: Sentinel

Delta Attack
• Fang: Commando
• Hope: Ravager
• Snow: Sentinel

Solidarity
• Fang: Commando
• Hope: Medic
• Snow: Sentinel

Mystic Tower
• Fang: Ravager
• Hope: Ravager
• Snow: Sentinel

For this fight, all Snow is going to do is get beaten up. He'll be absorbing all of the attacks, allowing you free reign with Fang and Hope. There isn't much of a strategy besides that. Attacus can't be staggered, nor does he have any elemental weaknesses. Your best bet is to have deprotect and deshell on him while having haste, faith and bravery on both Fang and Hope. Use the Rav/Rav/Sen paradigm to raise his stagger bar a bit higher so you can do more damage as a commando. Whenever he loses his debuffs, make sure to cast them again. Especially deprotect.

By far the hardest mission is the last one: Atticus the Soulless. He's one of the strongest enemies in the game with 9 million HP.

I did this mission after beating the game with Lightning as party leader, Fang and Snow. Switch to a Medic, Sentinel, Sentinel team when he's meditating. Then after he attacks have Fang switch to Saboteur to debuff him. Just make sure you keep one person as a Sentinel when you switch to attacking mode.

It took me more than 10 minutes and I still 5-starred it.

I just got this done yesterday and thought I would offer my own recipe for success.

Every one of the trials is relatively easy depending on your setup, crystarium level, weapons and accessories, etc. Here is what I have been doing for sometime now:

Team:
Lightning (leader)
Hope
Fang

Paradigms:
1. SAB/SYN/SAB
2. RAV/RAV/COM
3. COM/RAV/COM
4. MED/SYN/SEN
5. MED/MED/SEN

For weapons I have tier 3 only for the extra ATB, and so far I have only seriously upgraded Fang's (taming pole I believe has the stagger lock; turned into Kain's Lance and have it at level 89). Fang with the Genji Glove, 2 speed sashes and an imperial armlet not only does devastation when an opponent is staggered, but with the Random: Instant Chain ability (2 speed sashes) she also has a small chance to stagger on her own.

I have Lightning set up with her Omega Weapon (from the Lionheart for Quick Stagger), a speed sash, an energy sash, sprint shoes and the aurora scarf. This does a few very beneficial things, including the Random: Instant Chain, Auto-Haste, First Strike, and one ability that no one should overlook: ATB + 10%. Lightning does not hit as hard with this setup, but she hits extremely often which increases the chances of hitting that Insta-Chain.

Hope is set up with the top tier bangle (forget the name) because his HP is terrible, an imperial armlet and 2 speed sashes. His weapon is also 3rd tier.

Everyone has mastered all their primary roles and 1 of their secondary roles.

So, now the Atticus fight:

- Start with Paradigm 1 from the list above. Your objective really, above everything, is for Fang to hit him with Slow. Slapping him with anything else is a nice bonus. Hope should also have casted a few buffs on everyone as well (mostly protect and haste are what you want here)
- Once he has Slow on him, switch to Paradigm 2 and just wail on him. It will look like nothing is happening with his life gauge, but trust me, it is going down. Use Lightning's "Army of One" move a lot here as it builds the chain rather well. Stay in this paradigm until slow goes away, then switch back to Paradigm 1.
- The trick is to stay on him and get that chain gauge up. I had hoped the Insta-Stagger trick with the speed sashes would work on him (and they may) but I did not see it happen for me. Once his Chain is around 500% switch to Paradigm 3 and continue to wail on him with 2 commandos.
- If you need health OR you see the word "Concentrate" or "Meditate" above Atticus, switch to Paradigm 4 or 5 (depending on if you want buffs or not).

Concentrate is not that bad to deal with in terms of damage, but Meditate can be a 1 hit kill.

I had him down in a little over 7 mins.