Cheat Codes
Pause the game, and enter one of the following codes below. If you entered the code correctly, you will hear a sound. If you don't hear a sound, you're didn't do it properly. Press Start to resume the game with the code or numerous codes activated.

Refill Stasis and Kinesis energy
Pause the game and press X, Y(x2), X, Y.
Refill oxygen
Pause the game and press X(x2), Y(x3).
+2 Nodes
Pause the game and press Y, X(x3), Y.
+5 Nodes
Pause the game and press Y, X, Y, X(x2), Y, X(x2), Y, X(x2), Y.
+1,000 credits
Pause the game and press X(x3), Y, X.
+2,000 credits
Pause the game and press X(x3), Y(x2).
+5,000 credits
Pause the game and press X(x3), Y, X, Y.
+10,000 credits
Pause the game and press X, Y(x3), X(x2), Y.

Military Suit in Impossible Mode
Successfully complete the game in New Game Plus mode with the Military suit bought and equipped, and save the game immediately before the final Boss. Once the game ends and the credits begin, skip them, and do not save the game when prompted. Instead, immediately start a new game on the Impossible difficulty to start with the Military suit.

Secret Message Key
In Chapter 1, just after you repair the claw for the tram, hit your objective finder. Follow the blue line into the hallway where you need to go. Stop as soon as you enter the hallway, and look up at the catwalk above your head; ignore the alien for now. Walk until you find the first corridor on the right. Walk in there to see writing in an alien language all over. Look down to see a message in English that reads "Don't listen to their lies, read what they're really saying." Keep reading to find a key that shows the alien language, and below that English letters from A to Z and 1 through 0. Although not everything will be legible, you should be able to decipher enough to understand what is written.

Finding the Peng Treasure
You must be on the flight deck on Chapter 13. When in the flight room where your ship "used" to be, look between the walkways. You should see a statue. Pick it up with kinesis, and you will get the Peng Treasure and "There's Always Peng!" achievement. It can also be sold for 30,000 credits.

Completion Bonus
Successfully complete the game on the Normal difficulty to unlock Ten Power Nodes, 50,000 credits, Level 6 suit schematic, Impossible difficulty, and the back story log entries. And then let the carnage begin....

Achievements
Accomplish the indicated achievement to get the corresponding number of Gamerscore points:

Dead On Arrival (20 points): Complete Chapter 1 on any difficulty setting.
Lab Rat (20 points): Complete Chapter 2 on any difficulty setting.
All Systems Go (20 points): Complete Chapter 3 on any difficulty setting.
Cannon Fodder (20 points): Complete Chapter 4 on any difficulty setting.
True Believer (20 points): Complete Chapter 5 on any difficulty setting.
Greenhouse Effect (20 points): Complete Chapter 6 on any difficulty setting.
S.O.S. (20 points): Complete Chapter 7 on any difficulty setting.
Strange Transmissions (20 points): Complete Chapter 8 on any difficulty setting.
Wreckage (20 points): Complete Chapter 9 on any difficulty setting.
Keeper of the Faith (20 points): Complete Chapter 10 on any difficulty setting.
Betrayed (20 points): Complete Chapter 11 on any difficulty setting.
Exodus (20 points): Complete Chapter 12 on any difficulty setting.
Epic Tier 3 Engineer (150 points): Complete the game on the hardest difficulty setting.
Survivor (50 points): Complete the game on any difficulty setting.
Pack Rat (10 points): Store 25 Items in the Safe.
Story Teller (20 points): Collect 75 Logs.
Legend Teller (40 points): Collect 150 Logs.
Full Arsenal (30 points): Own every Weapon in the game.
Z-Baller (5 points): Complete Level 6 in Zero-G Basketball.
Merchant (10 points): Collect 8 schematics.
Armstrong (10 points): Shoot 50 objects using Kinesis.
Marksman (5 points): Dismember 20 Limbs.
Surgeon (20 points): Dismember 500 Limbs.
Butcher (40 points): Dismember 1000 Limbs.
Freeze (15 points): Use Stasis on 50 enemies.
Crackshot (5 points): Achieve a perfect score in the Shooting Gallery.
Air Alert (10 points): Zero-G Jump over 100 times.
One Gun (40 points): Beat the game using only the Plasma Cutter.
Brawler (10 points): Kill at least 30 enemies with a melee attack.
Maxed Out (75 points): Upgrade all weapons and equipment.
Ragdoll Check (5 points): Force an enemy into a Gravity Panel 5 times.
Big Spender (10 points): Spend 300,000 credits at the store.
Full Contact (10 points): Kill 30 enemies with the Contact Beam.
A Cut Above (10 points): Kill 30 enemies with the Ripper.
Tool Time (10 points): Kill 30 enemies with the Plasma Cutter.
Pusher (10 points): Kill 30 enemies with the Force Gun.
Live With The Hot Ones (10 points): Kill 30 enemies with the Flamethrower.
Autofire (10 points): Kill 30 enemies with the Pulse Rifle.
Eviscerator (10 points): Kill 30 enemies with the Line Gun.
There's Always Peng! (15 points): Find the Peng Treasure.

There are eight secret achievements, most of which are unknown:

Exterminator (15 points): Kill the Leviathan.
Brute Force (15 points): Kill a Brute.
Secret achievement (30 points): Unknown.
Secret achievement (10 points): Unknown.
Secret achievement (10 points): Unknown.
Secret achievement (10 points): Unknown.
Secret achievement (10 points): Unknown.
Secret achievement (15 points): Unknown.

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