To unlock the Closed for Applications trophy in Far Cry New Dawn, you will need to recruit all eight of the game's Guns for Hire.
Two of the Guns for Hire will be automatically recruited as part of the story. They are:
Carmina Rye: Available from the beginning
The Judge: Added after the "Joseph's Secret" mission in Act 2.
To recruit the other six Guns for Hire, you will have to complete the side missions below:
Pastor Jerome:
Location - Ramone’s Lookout (east of Rye & Daugther Aviation)
Side Mission - Jerome Comes Home
Gina Guerra:
Location - Prosperity (After recruiting the specialist Sharky Boshaw - Story Related Act 2)
Side Mission - Mo’ Mommies, Mo’ Problems
Nana:
Location - Nana’s Perch (South-east of Signal Point Outpost)
Side Mission - Crow’s Feet, Eagle’s Eyes
Hurk Drubman Jr.:
Location - East of Trailer Town Outpost
Side Mission - Days of Blunder
Timber (Dog):
Location - Meatfort (East of Broken Forge Outpost)
Side Mission -Man Eat Dog World
Horatio (Wild Boar):
Location - Elsinore Farm (North-west of The Pantry outpost)
Side Mission - To Love a Boar