There are 10 extra characters or couples you can convince to take residence in your Homestead area. Their missions are identified by white Homestead icons. Listed are each settler, their function, any mission requirements to make them available, and the map you'll discover them on. Once you find them, you'll have to do a 1st mission for them to consider settling at the Homestead. Achilles is included here as an 11th resident because he has his own Homestead missions as well, but you don't need to recruit him.
unlocked in Sequence 5
Godfrey & Terry (Lumberers)
complete Sequence 5 "The Lost Son's Return"
found in Homestead
Lance (Woodworker)
complete Sequence 5 "River Rescue"
found in Homestead
Warren & Prudence (Farmers)
complete Sequence 5 "Training Begins" and 1st Woodworker mission "The Whittler's Weapons"
found in Frontier
unlocked in Sequence 6
Norris (Miner)
complete Sequence 6 "The Revolution" and 1st Farmer mission "Abused"
found in Boston
Myriam (Huntress)
complete Sequence 6 "The Revolution"
found in Homestead
unlocked in Sequence 7
Achilles
complete Sequence 7 "The Templar Web" and 1st Innkeepers mission "Room at the Inn"
found in Homestead
Oliver & Corrine (Innkeepers)
complete 2nd Farmers mission "Prudence's Primrose" and 2nd Huntress mission "White Trophy"
found in Homestead
unlocked in Sequence 8
Father Timothy (Priest)
complete 3rd Farmers mission "Happy Expectations" and 1st Tailor mission "Cutting Ties" and 1st Innkeepers mission "Room at the Inn" and 2nd Huntress mission "White Trophy"
found in Homestead
Lyle White (Doctor)
complete 1st Priest mission "Finding His Flock" and 4th Farmer mission "Pig Herder"
found in Boston
Big Dave (Blacksmith)
complete 4th Miner mission "Raw Materials"
found in Frontier
unlocked in Sequence 9
Ellen (Tailor)
complete 1st Miner mission "The Brawler" and 1st Innkeepers mission "Room at the Inn"
found in New York
If you need further assistance, try these links to guides for all homestead missions:
TA AC3 Walkthrough - Homestead Missionsubisoft.com Homestead missions pageign.com Homestead walkthroughgamesradar.com Homestead walkthroughgamerguides.com Homestead walkthroughThe above achievement is necessary to get this other homestead achievement