Here is a guide that I made that shows all the pilot helmet locations. You can just go for the first ten or what ever is easy for you and it should unlock. I hope it helps!
Mission starts at:
The Pilot's Gauntlet 0:13
BT-7274 0:45
Blood and Rust 1:35
Into the Abyss 4:42
Effect and Cause 9:06
The Beacon 11:38
Trial by Fire 15:52
The Ark 17:04
The Fold Weapon 18:00