Dead Space - Cheat mode

Refill oxygen:
Press X, X, Y, Y, Y.

Refill Stasis and Kinesis energy:
Press X, Y, Y, X, Y.

2 Nodes:
Press Y, X, X, X, Y.

1,000 Credits:
Press X, X, X, Y, X.

2,000 Credits:
Press X, X, X, Y, Y, Y.

5,000 Credits:
Press X, X, X, Y, X, Y.

10,000 Credits:
Press X, Y, Y, Y, X, X, Y.

Achievements:
Complete the following achievements to unlock Xbox Live 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.

Secret Achievements:
Secret achievement 15 points: Unknown.
Secret achievement 15 points: Unknown.
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.