This video showcases all the weapons that exists in the game that can be used by the players whether obtainable in normal playthrough or not.
Check out one of the animator that worked on this game's video on animation here:
https://www.youtube.com/watch?v=QGCcl0u0lag
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Video chapters
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0:00 - Stunstick(Chapter 0)
0:29 - SPAS-12(Chapter 0)
0:37 - Kicking(Bad Cop)
0:50 - Prototype Gauss Pistol
1:22 - Frag Grenade
1:40 - AR2
2:11 - MP7
2:45 - S.L.A.M
3:21 - SPAS-12
3:48 - MP5K
4:22 - .357
5:00 - Xen Relay Grenade
6:09 - APC
6:46 - RPG
7:06 - Emplacement Gun
7:38 - Tau Cannon
8:11 - Crossbow
8:35 - Prototype Pulse-Rifle
9:17 - Stunstick
9:45 - "Portal" Gun
10:46 - Gravity Gun
11:27 - P226(Cold Signal)
11:53 - Benetti Nova(Cold Signal)
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Twitter: https://twitter.com/TheAlanDude1