A Giant Mistake – In Bresha Ruins 5AF, you will have to fight the giant Atlas. You’ll fight him right after you enter the ruins. The second time, you have the choice of activating a control mechanism which will weaken him or fight him directly. If you skip the control mechanism and just fight him, victory will bring a Paradox Ending.
Mog’s Marvelous Flan Plan – In Sunleth Waterscape 300AF, you’ll have to fight his Royal Ripeness once when you meet Snow. Afterwards, you can search for a Paradox to resolve before you fight him Royal Ripeness and weaken him (to a Mutantomato) or you can fight him directly. If you just fight him directly and win, you will cause a Paradox Ending.
Vanille’s Truth – You will need to Paradox Scope which is gained in Serendipity after beating the game. Turn it on and return to Oerba. Time Reverse Oerba and then proceed to the battle with Caius again. He’ll be tougher this time but if you beat him, it’ll create a Paradox Ending.
Test Subjects - You will need to Paradox Scope which is gained in Serendipity after beating the game. Turn it on and return to Augusta Tower 200AF. Time Reverse Augusta Tower and then proceed to the battle with the Proto fal’Cie Adam again. Fight the fal’Cie and win for a Paradox Ending.
The Future is Hope - You will need the Paradox Scope which is gained in Serendipity after beating the game. Turn it on and return to Academia 4XXAF. Time Reverse Academia and return to the Academy HQ. Turn in all of the Graviton Cores again but don’t skip the cutscene or you’ll skip a very important Live Trigger. Alyssa will offer you an Artefact. Refuse to take it.
Beneath a Timeless Sky - You will need the Paradox Scope which is gained in Serendipity after beating the game. After you get the previous Paradox Ending, turn off the Paradox Scope and proceed normally until you get sucked into the Void Beyond (with all of the Yuels). Make your way through here and just before you talk to the last Yuel, activate the Paradox Scope again. Fight Caius and win for a Paradox Ending.
Fate and Freedom - You actually don’t need the Paradox for this one. After you get the previous Paradox Ending, turn off the Paradox Scope and proceed normally through the fight with Caius. You’ll come to a point where you are in a fake New Bodhum. After talking to Snow in NORA house, Lightning will appear on the pier. Talk to her and when she offers to let you stay, say Yes instead of No. This will cause a Paradox Ending.
Heir to Chaos - You will need the Paradox Scope which is gained in Serendipity after beating the game. After you get the previous Paradox Ending, turn off the Paradox Scope and proceed normally until you get to the Dying World. Activate the Paradox Scope and make your way to the fight between Noel and Caius. Fight this battle and win for a Paradox Ending. You need to be fairly strong since it’s a one on one fight. I’d start with Ravager, stagger him and then immediately change to Commando. This should bring him to half health when he will break the Chain Gauge. Ravage and stagger him again, then kill him as a Commando. After he revives, heal up and then Ravage, Stagger and Commando him again to beat him.
