This is a guide for those who are starting fresh and need help with where to get each weapon. I will list the missions where they can be found. Remember in order to obtain the weapons you must have them equipped before beating the mission. The simulation mission aka Datacore Demolition does not count for getting any weapon.

Pistols P9P - Mission 2, 3, 7, 8 Magsec 4 - Mission 4, 5, 6, 10 DY357 Magnum - Mission 3, 5, 6, 11 Psychosis Gun - Mission 7, 8, 10 Falcon - Mission 1

SMGs DW-PS - Mission 2, 3, 4, 9, 10, 12 RCP-90 - Mission 9, 10, 11, 12 CMP-150 - Mission 7, 8, 12 UGL - Mission 2, Mission 12

Assault Laptop - Mission 7, 8, 10 KSI-74 - Mission 5, 6 SuperDragon - Mission 11, 12 FAC-16 - Mission 11, 12

Heavy Jackal - Mission 3, 4, 7, 11, 12 M60 - Mission 3, 4, 6, 12 Rocket Launcher - Mission 6, 12 Plasma Rifle - Mission 10, 12 Shockwave Rifle - Mission 12

Close Combat Def-12 - Mission 1, 2, 11, 12 Combat Shield - Mission 7, 8, 12 Viblade - Mission 4, 13

Thrown Flashbang - Mission 5, 8, 11, 12 Frag Grenade - Mission 2, 9 Hawk Boomerang - Mission 7, 9 Multi-Mine - Mission 10

Notes Viblade in Mission 3 is in the laser section