Accomplish the indicated achievement to get the corresponding number of Gamerscore points:

Fore! (10 points): Hit a line judge.
One Small Step... (10 points): Win your first match in the World Tour.
...One Giant Leap! (15 points): Win your first tournament in the World Tour.
Make Friends & Influence People (15 points): Make friends with 8 characters in World Tour.
Quick and Easy (15 points): Play and complete 25 events in Play mode.
Loving It (15 points): Achieve 25 Love Games.
Breaking the Speed Limit (15 points): Hit a serve over 200kph/124.28miles.
Big Hitter (15 points): Achieve 250 MAX Serves.
Pushing it to the MAX! (15 points): Achieve 3 Consecutive MAX Serves in a match.
Different Strokes (15 points): Win 400 stroke points.
Volleyball (15 points): Win 300 volley points .
Super, Smashing, Great! (15 points): Win 200 smash points.
Aces High (15 points): Score 100 Aces.
Over the Top (15 points): Win 50 lob shot points.
Drop and give me 50! (15 points): Win 50 drop shot points.
Your Country Needs You! (15 points): Be selected for the Davis Cup team or Fed cup in world tour.
Practise Makes Perfect (15 points): Win 10 Practice Matches in world tour.
Training to win (20 points): Clear a level 8 training game in the World Tour.
Schools Out (20 points): Clear each academy mission in the World Tour.
Shopaholic (20 points): Purchase 100 different items from the shop in world tour.
Versatile Male (20 points): Win a match with all Male Pro Players on default settings.
Versatile Female (20 points): Win a match with all Female Pro Players on default settings.
Marathon Man (20 points): Run a total of 10km.
Grass Stains (20 points): Play 100 matches on a Grass Court.
Play with Clay (20 points): Play 100 matches on a Clay Court.
Astro Carpet King (20 points): Play 100 matches on an Artificial Court.
King for a Day (25 points): Unlock the secret player King.
That Dukes a hazard! (25 points): Unlock secret player Duke.
Gold Medallist (25 points): Unlock every gold medal in the game..
Access all Areas (25 points): Purchase every Court Pass in World Tour.
Style Guru (25 points): Unlock every basic play style in World Tour.
Go Pro! (30 points): Turn professional in World Tour.
Leader of the Pack (30 points): Number 1 Amateur in the world.
National Treasure (30 points): Win the Davis or Fed Cup in World Tour.
First Amongst Equals (40 points): Rank #1 in the world in World Tour.
You are Gold! (30 points): Complete every academy mission with a gold medal in World Tour.
Last Man Standing (20 points): Beat all default Male Pro Players.
Last Woman Standing (20 points): Beat all Female Pro Players.
Competitive Streak (20 points): Complete 10 ranked matches in world tour.
Social Animal (20 points): Complete 10 player matches.

Additionally, there are ten secret achievements:

To be this good takes AGES (10 points): Score an Ace with an Underhand Serve.
Dr Doolittle (20 points): Feed all types of animal in a single game of Zoo Feeder.
Cherry Picker (20 points): Collect 10 cherries in a single game of Avalanche.
Block and Roll (20 points): Clear a 15 block combo in Blockbuster.
Arrrrrrr! (20 points): Sink 3 galleons in a single game of Pirate Wars.
Ham and Eggs (20 points): Bowl a Turkey on level 6 or above of Pin Crusher.
Perfect Frame (20 points): Clear the table of balls in order without missing in pot shot.
To Look this good takes SEGA (20 points): Play a game in the complete SEGA outfit.
Them Bones (30 points): Play the Meat Defender training game wearing the full Skeleton costume.
Coronation (30 points): Win King of Players tournament in World Tour.