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

- Getting past ventilation shaft as the Alien
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.

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

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

- Easy 'Ain't Got Time To Bleed' achievement
During the first wave in Survivor mode, kill all enemies except one alien. Let the alien get close and hit you once or twice, then run away while your health regenerates. When the alien gets close, face left or right, wait until you get hit with the claw, and then run away. If the alien tries the headbite, try to avoid it because it stuns you for a while. If you let the alien slash you once, it will take away approximately a half bar of health; thus, you will have to let the alien slash you 60 times to regenerate 30 bars of health to get the 'Ain't Got Time To Bleed' achievement. It is quicker to let the alien slash you twice, but is not as safe as just letting it slash you once.

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

- Achievements
Do the following things to obtain the corresponding Gamerscore points:

15 Points
Matter of Honor	Discover the Elite Predator's fate.
Fallen Comrade	Find the Youngbloods in the Jungle.
Eyes of The Demon	Retrieve the ancient mask.
Under Pushure	Solve the riddle of the Ruins.
I Admire its Purity	Finish Alien Campaign on Hard difficulty setting.
Fortune and Glory	Find all 45 Predator trophy belts.
Let's Rock!	Kill 5 enemies with one burst from the smartgun.
Scatter Shot	As a team, kill 20 enemies in under 60 seconds in a Survivor match..
Killer Instinct	Be victorious in your first Ranked Match in standard Deathmatch mode.
Ain't Got Time to Bleed	Heal or regenerate 30 blocks of health in Survivor.
Elite Sniper	Kill 10 enemies with head shots from the scoped rifle.
Breaking Quarantine	Escape from the Research Lab.
Quite A Specimen	Destroy all 50 Royal Jelly Containers.
Stay Frosty	Finish Marine Campaign on Hard difficulty setting.
Grunt Hunt	Wipe out all of the Marines in the Colony.
Grim Reaper	Harvest all available civilians in the Alien Campaign.
Spin Doctor	Kill two enemies with one throw of the Battle Disc.
Come to Mama	Liberate the Matriarch.
Harsh Language	Discover all 67 Audio Diaries.
I Like to Keep This Handy	Kill 2 enemies with one shot with the shotgun.
Very Tough Hombre	Kill 10 enemies sequentially without dying in a Ranked Match.
Reclaimer	Retrieve the second artifact.
Persecution Complex	Achieve Persecutor status more than once in any Ranked Match.
It Ain't No Man	Finish Predator Campaign on Hard difficulty setting.
Exit Strategy	Escape from C-Block.
Regicide	Overcome the Matriarch.
Welcome to The War	Play and complete your first Ranked Match in standard Deathmatch mode.
One Big Bug	Overcome the Praetorian.
It Uses The Jungle	Find a way through Gateway.
I Will Never Leave You...	Locate Tequila.
...That's A Promise	Get Tequila to surgery.
Club hopper	Survive The 'Party' at The Club.
You Have My Sympathies	Help Van Zandt.
World of Hurt	Survive trial by combat.
Breaking and Entering	Find a way into the Research Lab.
Stick Around	Kill 20 enemies with the Combi Stick.
30 Points
Magnificent, Isn't It?	Finish Alien Campaign on Nightmare difficulty setting.
Game Over, Man!	Finish all three Campaigns.
Extinction Agenda	Destroy the Abomination.
The Uninfected	Finish a Ranked Infestation match as the only remaining prey.
The Six Pack	Play with six friends in a Ranked Match.
Serial Killer	Be victorious in 10 Ranked Matches in any Deathmatch mode.
One Ugly Mother	Finish Predator Campaign on Nightmare difficulty setting.
Get to The Chopper!	Recover Weyland's datapad.
Welcome to The Party	Get 6000 XP in Ranked Matches.
Alien vs Predator	Create a new species.
Gunslinger	Kill 30 enemies with the pistol.
I LOVE the Corps!	Finish Marine Campaign on Nightmare difficulty setting.
50 Points
Not Bad for A Human	Get all the Aliens vs Predator achievements.
Real Nasty Habit	Get 18060 XP in Ranked Matches.

- Easy 'Spin Doctor' achievement
At the checkpoint in the 'Ruins' mission where you must activate the three species symbols switches to open the exit, activate your stealth, and bring up your Battle Disc. There will be two soldiers standing by each other. Line up it so you can hit both soldiers with the Battle Disc. Hit both soldiers to get the 'Spin Doctor' achievement. If you fail to get the achievement, reload the checkpoint, and try again.

- Audio Diary locations
Search the indicated locations to find all 67 hidden Audio Diaries:


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- Easy XP
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.