There are 49 Unique Weapons in Far Cry 6. This video shows all weapon locations for the Armed to the Teeth trophy / achievement. All non-unique weapons can be bought from the Guerrilla Garrison for money. For the Armed to the Teeth trophy / achievement you need ALL 49 Unique Weapons (there are exactly 49 of them, so you need 49/49 for the trophy). The 49 non-unique purchasable weapons DON'T count for this trophy.
The unique weapons are basically collectibles, hidden in chests with crocodiles on them. You can see their chest icon on the HUD Minimap when nearby.

None of the Unique Weapons are missable. You can still get all of them after the story in free-roam. In the Arsenal Menu you can see which ones you have found and which ones are missing (it also shows a tip where the weapon is when scrolling over it in Arsenal Menu). The Resolver Weapons do NOT count for this.

UNIQUE WEAPONS TEXT/SCREENSHOTS GUIDE: https://www.powerpyx.com/far-cry-6-all-weapons-locations/

TIMELINE UNIQUE WEAPONS (SAME ORDER AS IN-GAME ARSENAL MENU):

Rifles:
#1 - Death Rites - 0:00
#2 - F*ck Anton - 0:30
#3 - Viva Libertad - 1:22
#4 - Camo Quinceanera - 1:43
#5 - Sharkbite - 3:03
#6 - Noblesse Oblige - 3:29
#7 - One Ping Only - 3:52
#8 - Vaya Con Dios - 4:18
#9 - Surf & Turf - 4:49
#10 - Hi-Fi - 6:03
#11 - Urushi - 6:25
#12 - Zona-51 - 6:47

Submachine-Guns:
#13 - Iron Curtain - 7:32
#14 - Turn Of the Century - 7:54
#15 - Carriage Carnage - 8:14
#16 - Streamline Moderne - 8:58
#17 - DIY Death - 9:46
#18 - SMG-Issimo - 10:05
#19 - The Heroic End - 10:23

Light Machine Guns:
#20 - Sink or Swim - 10:49
#21 - Impact Driver - 11:18
#22 - Crackle & Pop - 11:47

Sniper Rifles:
#23 - El Depredador - 12:25
#24 - Sobek Special - 12:55
#25 - Double Clutch - 15:34
#26 - El Tirano - 16:03
#27 - The Transubstantiator - 16:42

Shotguns:
#28 - Humidora - 17:07
#29 - El Rubi - 17:50
#30 - Ciervo Macho - 19:15
#31 - The True Loyalist - 19:46
#32 - Excavation Execution - 22:32
#33 - Supercharger - 25:50
#34 - COM.PEW.TER - 27:11

Bows:
#35 - Recurve Bow - 27:42
#36 - Compound Bow - 28:07

Launchers:
#37 - La Guaracha - 28:41
#38 - El Caballero - 28:58
#39 - La Petite Mort - 29:25
#40 - Into Orbit - 32:11

Pistols:
#41 - Blood Drunk - 34:09
#42 - The Autocrat - 34:32
#43 - Lethal Dose - 35:10
#44 - El Florecer - 36:32
#45 - El Regalo De Clara - 36:52
#46 - Pistola Sportiva - 37:15

Auto-Pistols:
#47 - Rococo Loco - 37:38
#48 - El General - 39:15
#49 - Snapshot - 39:48

Far Cry 6 Trophy Guide & Roadmap:
https://www.powerpyx.com/far-cry-6-trophy-guide-roadmap/

Far Cry 6 - 100% Completion Wiki & All Collectibles:
https://www.powerpyx.com/far-cry-6-wiki-strategy-guide/

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