F.3.A.R.
Cheat Codes/Hints
Easy "Dead Blind" and "I F.E.A.R. Nothing!" achievements
Select Solo Practice mode, then the "Mechanized Invasion" scenario under the Insane difficulty setting. Try to avoid shooting Alma.
Easy "Head Crab Removal", and "Unstoppable" achievements
Select Multiplayer mode, choose "Solo Practice", then a Soul King map. Set the length of the rounds to three minutes and the total length of the game to five rounds. The achievement should be earned after four games.
Easy "Indecisive" achievement
Select Multiplayer mode, choose "Solo Practice", then a Soul King map under the Recruit difficulty setting. Possess everyone you encounter. As long as the body you are currently possessing does not get killed, the cooldown between possessions will be minimal. Keep swapping until the achievement is earned.
Easy "Soul Gatherer" and "Soul Hoarder" achievement
Start a network game. Although a second player is required, they can just remain idle after joining the game. Select the "Fresh Fish" map, with a five minute time limit, 5 rounds, the Recruit difficulty setting, and Join option "Closed". "Soul Gatherer" can be earned after the first round, and "Soul Hoarder" can be earned after five rounds.
How to Get 'Junk Collector'
If you have the patience, you can do 60 item pick-ups with a maxed-out weapon when you locate more ammunition of the same type. Fire off one round and reload your weapon. By docking one bullet from your ammo reserve stock, you fulfill the "pick-up" condition. Repeat it 59 more times and you will achieve the Junk Collector 60/60 Achievement.