Mercenaries

Enter the following button combination cheats on the PDA factions screen.
The sound of a click will confirm, if the typed codes are accepted.

Unlock all bonuses
Press Right, Right, Left, Left, Up, Up, Down, Down, Up, Right, Left, Down,
Down, Left, Right, Up, Down, Down, Up, Up, Left, Left, Right, Right

Unlockable skins:
You cannot enabled the following codes until the "All bonuses" code is
active. The sound of a click will confirm, if the typed codes are accepted.

Play with SK Elite: Press Left, Left, Right, Right, Down, Down, Up, Down
Play with Peng: Press Left, Left, Right, Right, Up, Down, Down, Left
Play with NK Spades Card: Press Left, Left, Right, Right, Down, Up, Up, Down
Play with NK Hearts Card: Press Left, Left, Right, Right, Up, Down, Down, Up
Play with NK Elite: Press Left, Left, Right, Right, Down, Down, Down, Up
Play with Mafia Soldier: Press Left, Left, Right, Right, Down, Up, Down, Up
Play with Josef: Press Left, Left, Right, Right, Down, Up, Up, Up
Play with Indiana Jones: Press Left, Left, Right, Right, Up, Up, Down, Down
Play with Hans Solo: Press Left, Left, Right, Right, Up, Down, Up, Up
Play with Doctor: Press Left, Left, Right, Right, Down, Up, Down, Down
Play with Col. Garrett: Press Left, Left, Right, Right, Up, Down, Down, Right
Play with Buford: Press Left, Left, Right, Right, Up, Down, Down, Down
Play with Allied Pilot: Press Left, Left, Right, Right, Up, Down, Up, Down
Play with Ace Of Diamonds: Press Left, Left, Right, Right, Down, Down, Up, Up
Play with Prisoner Of War:
Press Left, Left, Right, Right, Down, Down, Down, Down

Unlock shop items
Press Down, Down, Down, Down, Up, Left, Right, Right

Unlimited health
Press Up, Down, Up, Down, Left, Right, Left, Right.
or
press Up, Down, Up, Left, Left, Right, Right, Right

Unlimited ammo
Press Right, Left, Right, Right, Left, Right, Left, Left.

More money
Press Right, Down, Left, Up, Up, Left, Down, Right.

Get all factions neutral
Press Up, Up, Up, Up, Down, Down, Right, Left.

Burnout:
While in a car, hold X + R + A

Not paying Medivac:
To avoid to paying the 10,000 when you warp to the medivac, save your
game, then load back you saved game files.