We know that you love the game, and you loved the story more than that. But, let's be honest here. You cannot have the fun you REALLY want to have without using some cheats. I mean, sure you can work hard and gain those powerful swords, armors, etc. but who wants to spend those extra hours when you can just use these cheats and get them in minutes.
So, without any further ado, here are the cheats of the game that we never hate - Assassins Creed: Unity (damn their trailers are always awesome)
The Medieval Armor
You'll have to solve all the 18 Nostradamus Enigmas. You'll have the 18 fragments after that. Use those fragments on the Nostradamus Disc in the armor room of the Café Theatre. This will unlock 3 puzzles. Solve the puzzles. This should unlock the Medieval armor.
You can then equip the armor from the character customization screen. Choose the outfit named "Thomas de Carneillon's Master Assassin Outfit". Once you equip the Medieval armor, you will get the "From The Past" trophy.
Eagle of Suger Sword
If you haven't checked it out yet, it is a very powerful sword. To get it, you will have to solve all the seven Suger's Legacy riddles. They are similar to the Nostradamus Enigmas, you will just have to find hidden symbols in the town of Franciade.
The first two Suger Legacy quests cannot be missed because they take place after completing the Sequence 13: Memory 3. They then unlock the starting points for the remaining 5 quests on the map. In order to play the "Dead Kings" DLC, and also to access the town of Franciade, you should use the carriage near the Café Theatre in Paris.
Bonus cheats:
Clothing
To obtain the desired piece of clothing, you will have to complete the indicated task. Once completed, you can change Arno's appearance in the Character Customization screen from the Gear Loadout statue in the Café.