Item description:

continue with the story, finish the mission and you'll get

Curtain Call
Complete Memory Sequence 12.

I Want It All
Complete all Single Player mission challenges in Paris.

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after you are back in paris , open the menu and unlock the last skill. it is the
Improved Phantom Blade from the Ranged section. you'll get

I Got Skills
Unlock all Skills.

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you can travel to Versailles

here you can see one last chest, cockade and a viewpoint on the map.

go get all three and you receive

Panoramic View
Synchronize all Viewpoints in Paris.

Tricolore
Collect all Cockades

Curiosity
Open every chest in Paris.

Ransacking Versailles
Earn 100% completion of Versailles.

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here you can get some co-op trophys. you can select the co-op missions by
press the options button -> "progress tracker" -> co-op mission tab

first complete the "Heads Will Roll" co-op mission and you'll get

Share the Wealth
Get all the rewards in a Co-op mission in Paris.

now complete the heist mission "Tithing Templars" to get

Visited Once
Complete all Co-op and Heist missions at least once.

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now we come to the rift missions. you can select the rift missions by
press the options button -> "progress tracker" -> rift missions tab

complete the Rift Mission "Medieval - Quarry", during this mission free the assasin to get

Thawed
Free a total of 10 trapped Assassins.

then go for the Data Bonuses ( To earn a data bonus, you must get the second score requirement
after you complete the first one.) and you'll get

Needs More Data
Earn Data Bonuses in 3 different Helix Rifts.

after you finished the mission you'll get

No Man's Land
Complete all Rift missions.

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play the last social club mission. to see the mission you can select the last Social Club mission
"Bridge Brigands" by pressing the options button -> "progress tracker" -> Social Club mission

complete the last Social Club mission to receive

An Old Internet Meme
Renovate all the Social Clubs and complete all the Social Club missions.

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equip an long weapon and kill 2 more enemies and you'll get

Poked!
Kill 20 enemies with a Long Weapon.