Press F8, then activate the following cheats by entering the corresponding codes and pressing ENTER. Press F8 again to resume the game.

CHEAT FUNCTION - CHEAT CODE
Rain - dh5water
Lightning - dh5zeus
Thunder - dh5thor
Blowing leaves - dh5leaves
Animals not afraid of hunter - dh5nofear
Travel to nearest animal - dh5findnext
Travel to nearest wolf - dh5findwolf
Finds deer - dh5fnd or dh5find
Deer attracted to you - dh5beacon
Deer shown on map - dh5showme
Bigger deer - dh5monster
Player in a truck - dh5truck
No sound - dh5damper
Bullet view - dh5leadeye
Sight gun - dh5sightin
Never tire - dh5homegym
More blood - dh5f13

Unlock the following trophies by performing the corresponding tasks:

TROPHY - HOW TO UNLOCK
Bronze Grand Slam trophy - Shoot one buck from each species.
Gold Grand Slam trophy - Shoot one world record buck from each species.
Gold Skin trophy - Get a gold skin for all weapons.
Master Hunter trophy - Earn 100 points.
Seasoned Hunter trophy - Accumulate at least ten hours of game play.
Silver Grand Slam trophy - Shoot one record book buck from each species.

Hold RIGHT SHIFT while walking to move faster.

To move faster while driving a vehicle or riding a horse, hold SHIFT.