Sequence 1 has a total of 9 memories.
I wrote this guide as a simple checklist (click on the spoiler if you do not mind seeing the title or “subtitle” of the memory) to help you keep up with: what you have completed, how many memories you have left in the sequence, which memories have secondary objectives, and what those objectives are (so you can prepare before starting the next memory).
*** Spoiler - click to reveal ***Sequence 1
Memory 1: Only a Nightmare, “The past is gone but not forgotten”
Memory 2: New Orleans by Night, “Master the rooftops in disguise”
Memory 3: A Slave in Trouble, “Infiltrate the plantation and find the missing slave”
Memory 4: The Safe House, “Charity begins at home”
Memory 5: Taking Care of Business, “A little charm goes a long way”
2ndary Objective: Avoid killing anyone
Memory 6: Father’s Troubles, “Search the docks for the stolen cargo”
2ndary Objective: Charm at least 1 guard
Memory 7: The Key to the Problem, “Investigate how to infiltrate the Governor’s Mansion
Memory 8: The Colony’s Good, “Cut short Governor d’Abbadie’s plans
2ndary Objective: Enter the mansion dressed in the Lady or Slave Guise
2ndary Objective: Kill the governor using a musket
Memory 9: The Esacape, “After D’Abbadie’s assassination Aveline seeks safety in the Bayou
To keep this solution clean and concise, I have not included hints for the secondary objectives. I wrote this to help in planning ahead (getting enough poison darts, bullets, or smoke bombs) to make the second objectives easier. Please comment if you do need any help and I will provide any help or suggestions I can. I hope you find this helpful and good luck going for 100% sync!