Security Guard These 'guards' are actually involved with the Cult of the Dark Queen. They can use riot shields and attack with batons, or use a handgun.
FIRST APPEARANCE: Museum
Rat An easy pest to remove. There's much more to add.
FIRST APPEARANCE: Museum
Doberman Only seen briefly in a couple of levels. They will jump at Lara and try to bite her. Walk backwards as you shoot to keep distance between you.
FIRST APPEARANCE: Museum
Goon These followers of the Cult of the Dark Queen always carry a gun and they are often upon a ledge that you have to climb up to. Just face them and shoot. You'll see these guys a lot in the upcoming levels.
FIRST APPEARANCE: Rooftops
Zombie You'll also see these guys in future levels too. Their only means of attack is to approach Lara and swipe at her. Use rapid bullets; in the early levels, you won't have enough shotgun bullets to use against them.
FIRST APPEARANCE: Subway
Spider Not too threatening an enemy... Unless you really don't like spiders! You might be able to just run past them.
FIRST APPEARANCE: Jungle
Scorpion These critters are often hiding in the grass. They will use their stingers to attack.
FIRST APPEARANCE: Jungle
Snake Also often found hiding in the grass, although they will lift their heads and move to try and ward Lara away. They don't take much killing.
FIRST APPEARANCE: Jungle
Sources
Enemy Images Captured from videos recorded by Youtuber 'MP'.