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You can unlock additional skins by reaching the following levels:
Alien / Nethead – Achieve Rank 34
Alien / Praetorian – Achieve Rank 19
Alien / Ridged – Achieve Rank 10
Alien / Warrior Dome – Achieve Rank 04
Marine / Connor – Achieve Rank 05
Marine / Gibson – Achieve Rank 02
Marine / Johnson – Achieve Rank 22
Marine / Moss – Achieve Rank 13
Marine / Rookie – Achieve Rank 28
Predator / Claw – Achieve Rank 03
Predator / Hunter – Achieve Rank 16
Predator / Spartan – Achieve Rank 31
Predator / Stalker – Achieve Rank 07
Predator / Wolf – Achieve Rank 25 Read more…

Here is a list of the trophies for Aliens .vs Predator on the PlayStation 3 and xBox 360. Read more…

Rumbler Fumble
When you fight a Rumbler — the Big Daddy with rockets — use telekinesis to grab the rockets it fires and turn them back towards it for an easy victory. Read more…

• Bought a Slot (5 points)

Buy one Plasmid or Tonic Slot at a Gatherer’s Garden.

• Max Plasmid Slots (10 points)

Fully upgrade to the maximum number of Plasmid Slots.

• Upgraded a Weapon (10 points)

Upgrade any weapon at a Power to the People Station.

• Fully Upgraded a Weapon (10 points)

Install the third and final upgrade to any of your weapons.

• All Weapon Upgrades (20 points)

Find all 14 Power to the People weapon upgrades in the game.

• Prolific Hacker (20 points)

Successfully hack at least one of every type of machine.

• Master Hacker (20 points)

Hack 30 machines at a distance with the Hack Tool.

• First Research (5 points)

Research a Splicer with the Research Camera.

• One Research Track (20 points)

Max out one Research Track.

• Research Master (20 points)

Max out research on all 9 research subjects.

• Grand Daddy (25 points)

Defeat 3 Big Daddies without dying during the fight.

• Master Gatherer (30 points)

Gather 600 ADAM with Little Sisters.

• Fully Upgraded a Plasmid (10 points)

Fully upgrade one of your Plasmids to the level 3 version at a Gatherer’s Garden.

• All Plasmids (20 points)

Find or purchase all 11 basic Plasmid types.

• Trap Master (15 points)

Kill 30 enemies using only Traps.

• Master Protector (15 points)

Get through a Gather with no damage and no one getting to the Little Sister.

• Big Spender (15 points)

Spend 2000 dollars at Vending Machines.

• Dealt with Every Little Sister (50 points)

Either Harvest or Save every Little Sister in the game.

• Against All Odds (30 points)

Finish the game on the hardest difficulty level.

• Big Brass Balls (25 points)

Finish the game without using Vita-Chambers.

• Rapture Historian (40 points)

Find 100 audio diaries.

• Unnatural Selection (10 points)

Score your first kill in a non-private match.

• Welcome to Rapture (10 points)

Complete your first non-private match.

• Disgusting Frankenstein (10 points)

Become a Big Daddy for the first time in a non-private match.

• “Mr. Bubbles– No!” (20 points)

Take down your first Big Daddy in a non-private match.

• Mother Goose (20 points)

Save your first Little Sister in a non-private match.

• Two-Bit Heroics (10 points)

Complete your first trial in a non-private match.

• Parasite (10 points)

Achieve Rank 10.

• Little Moth (20 points)

Achieve Rank 20.

• Skin Job (20 points)

Achieve Rank 30.

• Choose the Impossible (50 points)

Achieve Rank 40.

• Proving Grounds (20 points)

Win your first non-private match.

• Man About Town (10 points)

Play at least one non-private match on each multiplayer map.

• Two Secret Achievements worth 5 points.
• Two Secret Achievements worth 10 points.
• One Secret Achievement worth 15 points.
• Six Secret Achievements worth 20 points.
• One Secret Achievement worth 50 points.
• Two Secret Achievements worth 25 points.
• One Secret Achievement worth 100 points.

These titles can be unlocked by performing the actions below online:
Astounding Power – Achieve rank A
Bomb Maniac – Earn 10 victories with the Explosive Wave
Capricious Warrior – Win 100 battles in cell games stage
Counter Monster – Execute 5 counters in a battle
Dirty Work – Take 5 Upwards Attacks in a battle Read more…

Stache Whacker Achievement
In part 4 of Dark Carnival, look for a Whac-A-Mole-like arcade game. Attack it with a melee weapon to destroy it (be “faster than Moustachio”).

Weapon Descriptions
Check the gunshop in Dead Center (first episode, second map) for an accurate description of every firearm in the game (except the grenade launcher).

Guardin’ Gnome Achievement
In part 2 of Dark Carnival you’ll come across a shooting range. Get a high score (500+) to make a lawn gnome appear (which you may recognize from Half-Life 2 Episode 2). Carry the gnome all the way to the end of the scenario (board the chopper) to unlock the Guardin’ Gnome (Chompsky) Achievement.

Gong Show Achievement
In part 4 of Dark Carnival, look for a strength-testing game in the first area. Inject some adrenaline and nail it with a melee weapon to get the Gong Show Achievement (be “stronger than Moustachio”).

Hint: Stuck In Rock or In Mid-Air?
Occasionally Lara becomes hung up on her environment or atop some breakable jars. If she cannot jump out of her predicament, try having her duck (hold the crouch button) and see if she can nudge herself out of being stuck.

Hint: Handstand and Flip Mantle
Hold the A BUTTON and stick direction towards Lara’s front when she clings onto a ledge for her to do a handstand mantle (high ledge) or flip mantle (low ledge).

White Swimsuit
Clear the story mode once and Lara will have the option to don a white swimsuit for subsequent replays of the Mediterranean Sea stage.

Story Boards
Clear the game on Master Survivalist difficulty to unlock story boards in the extras menu.

Lara Croft Concept Art
Collect all the relics in the game to unlock Lara Croft concept art.

Creature Concepts
Collect all the smaller treasures in each stage to unlock creature concept art in the extras menu.

Upgraded Battalions
Insert the passwords listed below on the left at the in-game cheats menu to unlock upgraded versions of the battalions listed on the right.
EUCA20 – European Federation
JSFA35 – Joint Strike Force
SPZT17 – Spetznaz

Tai Kaliso : To unlock Tai Kaliso for use in multiplayer, complete Act 3 in single-player mode on any difficulty.
Skorge : to unlock Skorge for use in multiplayer, complete Act 5 in single-player mode on any difficulty.
RAAM : To unlock RAAM for use in multiplayer, have the “A Dish Best Served Cold” achievement on your hard drive from the original Gears of War.
Lt. Minh Young Kim : To unlock Lt. Minh Young Kim for use in multiplayer, have the “Time to Remember” achievement on your hard drive from the original Gears of War.
Kantus : To unlock Kantus for use in multiplayer, complete Act 2 in single-player mode on any difficulty.
Insane Difficulty :To unlock the Insane Difficulty level, complete the game once through on any difficulty setting previously available.
Flame Grenadier : To unlock the Flame Grenadier for use in multiplayer, complete Act 4 in single-player mode on any difficulty.
Dizzy Wallin : To unlock Dizzy Wallin for use in multiplayer, complete Act 1 in single-player mode on any difficulty.
Anthony Carmine : To unlock Anthony Carmine for use in multiplayer, have any Act 1-related achievements unlocked on your hard drive from the original Gears of War.

Authentic Difficulty
To unlock Authentic Difficulty, beat the game on any other difficulty setting.

All Reconnaissance Reports
To automatically unlock all reconnaissance reports in the game, insert the following code at the in-game cheats menu: 0ZNDRBICRA. Read more…