Sequence 2 has a total of 7 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 2
Memory 1: The Loas Guide You, “Talk to the mentor, if you can find him”
Memory 2: The False Mackandal, “Help the mentor run from his past”
2ndary Objective: Complete the mission in under 2 minutes
Memory 3: Meet the Smugglers, “Get familiar with the base elements of the Bayou
2ndary Objective: Kill 1 guard using fast poison
Memory 4: A Faithful Acolyte, “Hunt down the mentor’s enemies”
2ndary Objective: Kill the followers in 3 minutes
Memory 5: The Second Camp, “Spare the innocent”
2ndary Objective: Kill only the Acolyte
Memory 6: Eve of Saint John, “Complete the mentor’s dirty work”
2ndary Objective: Perform a double assassination
Memory 7: The Whole Truth, “Tell as much of the truth as necessary”
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!