Activate the following cheats by entering the corresponding case-sensitive passwords at "Options" > "Passwords":

CHEAT FUNCTION - CHEAT CODE
Bridgestone items unlocked - notjusttires
Buick items unlocked - threestripes
EA items unlocked - inthegame
Grafalloy items unlocked - justshafts
Infinite money - cream
J. Lindberg items unlocked - jlindberg
MacGergoritems unlocked - mactec
Mizuno items unlocked - rihachinrizo
Nike items unlocked - justdoit
Oakley items unlocked - jannard
PGA Tour items unlocked - lightning
Ping items unlocked - solheim
Precept items unlocked - guysaregood
Taylormade items unlocked - mradams
Unlock Wayne Rooney - playfifa08
Unlocks all course - greensfees
Unlocks all golfers - allstars

To get "Perfect" shots, when you pull the Left Analog-Stick back, release it as if you are flicking it. Also put a lot of power into the shot.

ACHIEVEMENT - HOW TO UNLOCK
Old School (20 points) - Play an entire round offline using the 3-Click feature.
Ace Seeker (30 points) - Make a Hole in One.
Egg on the Dance Floor (20 points) - Successfully putt 75ft or more without using the putt preview line.
Bomb Away! (30 points) - Drive your tee shot more than 350 yards.
On Fire (30 points) - Finish a round with a score of -10 on TOUR PRO using an Original Golfer.
Afraid of the Dark (20 points) - Land the ball inches from the hole.
Pole Dancer (20 points) - Hit the flag pole.
All in the Family (35 points) - Beat a full 18 Hole round of each Traditional game mode using the same Original Golfer.
Tiger Coin-Op (20 points) - Beat a full 18 Hole round of each Arcade game mode using the same Original Golfer.
Mini-Golf (20 points) - Beat each Mini game using the same Original Golfer.
Zapper (10 points) - Post in each of the Free Style, Long Drive, 9 Hole Showdown, and 18 Hole Showdown channels.
Reality Star (35 points) - Play and beat a challenge in each of the Free Style, Long Drive, 9 and 18 Hole Showdown channels.
EA SPORTS GamerNet 1000 (35 points) - Get 1000 Producer Points on EA SPORTS GamerNet.
EA SPORTS GamerNet 5000 (75 points) - Get 5000 Producer Points on EA SPORTS GamerNet.
Anchor Man (10 points) - Create and Play a 4-player Online Match.
Big Spender (15 points) - Spend $5000 at the Pro Shop.
Collector (20 points) - Buy 25 items at the Pro Shop.
Weekend Warrior (30 points) - Beat 100% Tiger Challenge Bronze.
You Da Man! (50 points) - Beat 100% Tiger Challenge Silver.
Gold Card Membership (75 points) - Beat 100% Tiger Challenge Gold.
Viva Las Villegas! (20 points) - Beat Villegas in Tiger Challenge.
King of the Jungle (75 points) - Beat Tiger in Tiger Challenge.
XY (10 points) - Create a male golfer using Photo Game Face.
XX (10 points) - Create a female golfer using Photo Game Face.
Scrambler (20 points) - Rank in the top 10 of any offline tournament.
In the Hunt (30 points) - Rank in the top 5 of any offline tournament.
In The Zone (50 points) - Win any offline tournament.
FedEx Delivery (75 points) - Win the FedExCup.
Major General (75 points) - Win all 4 Majors.
Buick Clubhouse Member (10 points) - Beat Danny Wheeler in Tiger Challenge.
Buick Clubhouse Ambassador (25 points) - Beat Erika Von Severin in Tiger Challenge.