Condemned 2: Bloodshot

To get FPS mode you must finish one playthrough of the game on any setting. After that go into single player, select replay level, then the difficulty settings will come up. FPS will be at the bottom.

Complete any level you prefer in FPS mode for this achievement.

You unlock FPS mode once you complete the game, under any difficulty. This mode works great once you have the Gold Plated achievement, since you unlock the best bonuses. You (usually) begin each mission with a firearm of some type, with infinite ammunition. Your priority in FPS mode should be to kill enemies from as far away as possible, since you have firearms with unlimited ammo.

You can still use melee weapons, for times (like when you avoid the falling elevator in the hotel) when you need to. Enemies do greater damage than Easy difficulty, but not as much damage as hard difficulty. Since FPS is its own difficulty, you will also need to complete the game on hard if you're going for all of the achievements.

Another thing to note is that you also have inifinte tazer in FPS mode, once you get to the 4th level in the game (where the tazer unlocks). You can use the tazer to immediately stun enemies and just shoot them once to finish them (therefore, you don't have to go for headshots), and sometimes the tazer can be faster than whatever weapon you currently are weilding.

Always try to get a better firearm than what you're carrying, but you shouldn't have too much difficulty with this mode especially if you remember enemy locations in this game.

FPS mode is a mode where you have infinite ammunition, so use it frequently and always look for a better gun. to be honest, the best weapon is the MG the SCU use with the scope. high damage for high firing rate (also from hip shooting is extremely accurate), the best firearm you can actually achieve in my oppionion.
its FPS mode, so shoot a lot since blows tend to get fatal after the 3rd one. be careful and this shouldnt prove any problem.