Ammunition
Press Back while playing to bring up the objectives window, then press B, A, X, Y, Left, Right, Left.

Never die
Press Back while playing to bring up the objectives window, then press Down, Up, Down(2x's), Up, Right, Left, Right, Y, X(2x's), A. Your health will still lower, but will never get to zero.

Get all
Press Back while playing to bring up the objectives window, then press Up(2x's), Down(2x's), Left, Right, Left, Right, B, A.

Health
Press Back while playing to bring up the objectives window, then press B, A, B, A, Up(2x's), Down, X.

Multi-player ranks and awards
Finish the listed tasks to access the matching rank or award when your in multi-player mode.

Private (Multiplayer): Obtain 100 win points in ranked matches.
Corporal (Multiplayer): Obtain 500 win points in ranked matches.
Lieutenant (Multiplayer): Obtain 1000 win points in ranked matches.
General (Multiplayer): Obtain 5,000 win points in ranked matches.
Basic Training: Play more than 100 ranked matches.
First Tour of Duty: Play more than 500 ranked matches.
Combat Veteran: Play more than 1000 ranked matches.
Seasoned Warrior: Play more than 10000 ranked matches.
Number One: Achieve number 1 on the Leaderboards.
Top Ten: Achieve a top 10 rank on the Leaderboards.
Perfect Win: Win a ranked match without being fragged.
Bronze Flag: Obtain 100 flag captures in ranked matches.
Silver Flag : Obtain 500 flag captures in ranked matches.
Gold Flag : Obtain 1,000 flag captures in ranked matches.
Viper Squad : Obtain 100 frags in ranked matches.
Warthog Squad : Obtain 500 frags in ranked matches.
Raven Squad : Obtain 5000 frags in ranked matches.
Rhino Squad : Obtain 10,000 frags in ranked matches.
The Golden Gauntlet : Obtain 250 gauntlet frags.
The Best Impression : Obtain 250 Impressive medals in ranked matches.
Your Excellency : Obtain 500 Excellents in ranked matches.
Guts but no Glory : Obtain 100 Assists in ranked matches.
The Defender : Obtain 250 Defense awards in ranked matches.

Single player ranks and awards
Finish the listed tasks to access the matching rank or award when your in single player mode.

Private (Act 1 ): Finish Act 1 with the rank of Private.
Private (Act 2 ): Finish Acts 1 and 2 with the rank of Private.
Private (Defeated the Strogg ): Finish the game with the rank of Private.
Corporal (Act 1 ): Finish Act 1 with the rank of Corporal.
Corporal (Act 2 ): Finish Acts 1 and 2 with the rank of Corporal.
Corporal (Defeated The Strogg ): Finish the game with the rank of Corporal.
Lieutenant (Act 1 ): Finish Act 1 with the rank of Lieutenant.
Lieutenant (Act 2 ): Finish Acts 1 and 2 with the rank of Lieutenant.
Lieutenant (Defeated The Strogg ): Finish Acts 1 and 2 with the rank of Lieutenant.
General (Act 1 ): Finish Act 1 with the rank of General.
General (Act 2 ): Finish Acts 1 and 2 with the rank of General.
General (Defeated The Strogg ): Finish the game with the rank of General.
Untouchable: Finish a level without taking damage.
Blaster Master: Finish a level using only the blaster.
Hyperactive: Finish a level using only the hyperblaster.
Blazing Buckshot: Finish a level using only the shotgun.
The Machine: Finish a level using only the machine gun.
Tooth and Nail: Finish a level using only the nailgun.
Pineapple King: Finish a level using only the grenade launcher.
Ballistics Expert: Finish a level using only the rocket launcher.
Enlightening: Finish a level using only the lightning gun.
The Dark Lord: Finish a level using only the DMG.
The Sniper: Finish a level using only the railgun.
Full Arsenal: Finish a level where a shot with every weapon hits.
Solar Star of Courage: Fight alongside Viper Squad (Hangar2).
Sky Marshall's Medal of Valor: Rescuing Pvt. Lanier of Eagle Squad (Waste).
Galactic Order of Heroism: Fight alongside Raven Squad.