WEAPONS. Damage is for each shot and SF is secondary Fire.
 
Crowbar
10 Damage
SF:NO
 
9MM Pistol
5 Damage
SF:NO
 
.357 Magnum
40 Damage
SF:NO
 
Submachine Gun (SMG)
4 damage
SF:YES
100 Damage
 
12-Gauge Shotgun
56 Damage (Varies)
SF:NO
84 Damage (Varies)
 
Overwatch Standard Issue Pulse Rifle (OSIPR)
8 Damage
SF:YES
100 Damage
 
Zero Point Energy Field Manipulator (Gravity Gun)
Damage Varies
SF:YES
Damage Varies
 
Zero Point Energy Gravity Gun (Organic)
Damage Varies
SF:YES
Damage Varies
 
Frag Grenade
125 Damage
SF:YES
125 Damage
 
Rocket-Propelled Grenade Launcher (RPG)
200 Damage
SF:NO
 
CrossBow
100 Damage
SF:YES
100 Damage
 
Pherapods (Bugbait)
Immobilize (Combine Only), Death (Antlion Attack)
SF:YES
Same
 
Hopper
Doesnt say
SF:N/A
 
There you go.  

all enemies in the Game:  
 
AntLion
30 Health
 
AntLion Guard
500 health
 
Barnacle
35 Health
 
Leech
N/A Health
 
HeadCrab
10 Health
 
Poison HeadCrab
35 Health
 
Fast HeadCrab
10 Health
 
Zobie
50 Health
 
Zombie Torso (top part of zombie)
25 Health
 
Poison Zombie
175 Health
 
Fast Zombie
50 Health
 
Metro Cops
Varies From 26 to 40 Health
 
Combine Soldier
50 Health
 
Combine Elite
70 Health
 
Stalker (Not Enemies, Mutants that u dont encounter on Combine Zones)
N/A Health
 
Armor Personnel Carrier (APC)
750 Health
 
Hunter-Chopper
5,600 Health
 
ManHack
25 Health
 
RollerMine
N/A Health (cant be Killed With weapons, Must Toss them off mountains, lol)
 
Scanner Type 1
30 Health
 
Scanner Type 2
30 Health
 
Sentry Gun
N/A Health (I hope we all know how to defeat these, we saw them in vids)
 
Ground Turret
N/A Health (Can only be defeated by grenades)
 
Combine Dropships
N/A Health (Too Bad)
 
Combine GunShip
N/A Health (3 direct rpg hits on easy, 5 on medium, 7 on hard)
 
Combine Adviser
N/A Health
 
STRIDER!!!
N/A Health (Can be defeated same way as Combine GunShip Can)
 
Crab-Synth and Mortar-Synth
N/A Health
 
GOOD GUYS:
 
Repatriated Citizen
40 Health (KILL'EM ALL!!!)
 
Resistance Citizens
40 Health
 
GG. Not many Enemies. No boss either.