Aliens vs. Predator - Platform: XBox 360

Bonus skins:
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Reach the indicated rank to unlock the corresponding skin:

Gibson (Marine): Rank 2
Claw (Predator): Rank 3
Warrior Dome (Alien): Rank 4
Connor (Marine): Rank 5
Stalker (Predator): Rank 7
Ridged (Alien): Rank 10
Moss (Marine): Rank 13
Hunter (Predator): Rank 16
Praetorian (Alien): Rank 19
Johnson (Marine): Rank 22
Wolf (Predator): Rank 25
Rookie (Marine): Rank 28
Spartan (Predator): Rank 31
Nethead (Alien): Rank 34
Gibson (Marine): Rank 37
Lord (Predator): Rank 40
Van Zandt (Marine): Rank 43 

Easy XP:
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Search for a ranked match in Multiplayer mode. When it says "One player
in game, waiting for more players", quit, and go to the main menu. Then, 
load a Marine mission on the Normal difficulty with a lot of enemies, 
such as the Praetorian boss in the "Research Lab" mission. Simply kill
enemies now to get easy XP. Repeat this as many times as desired.


Finding collectibles:
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While playing as an Alien or Predator, activate your Focus to get
collectibles to appear as flashes on the HUD.


Avoiding instant kills as the Marine:
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In Multiplayer mode, keep your back against walls to prevent getting
killed instantly by Aliens and Predators.


Getting past ventilation shaft as the Alien:
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In Level 3 as the Alien, the Queen will tell you to get to the bottom of
a shaft with a huge fan at the top. When you get close to it, another
Xenomorph will be blown into the fan. If you use your Focus, you can see
two vents on the opposite wall. You can use either of them and safely
jump to it despite the power of the fan. As you continue, you will find
more vents to hide in. Use them to make your way down.