While playing the game, press Back to display the objectives window, then quickly press Down, Up, Down2, Up, Right, Left, Right, Y, X2, A. Your health will still decrease, but will never reach zero.
Full ammo for all weapons:
Multiplayerranks and awards
Basic Training: Play over 100 ranked matches.
Single Player ranks and awards
Ballistics Expert: Complete a level using only the rocket launcher.
Fast Weapon Achievement:
Pick a weapon in your inventory and exit the level. Upon loading the next map, do not change your weapon and proceed to kill the big monkey strogg enemy before you approach the tram and exit this map.
Simply reload the save game from the Data Processing Security tower and repeat the tram map with each weapon and you'll bag all the achievements quickly.
November 25, 2005 - 11:17am