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

Shrek Goes Green (30 points): Fill half of the Ogre Power meter (primary profile).
100% Green Ogre (50 points): Fill up the Ogre Power meter (primary profile).
Swamp Sweet Swamp (20 points): Use the magic mirror (primary profile).
Ogres Rock! (20 points): Win the training fight in the forest (primary profile).
Swamp Sweep (20 points): Defeat the witches in the Swamp (primary profile).
Towers Are For Sissies (20 points): Defeat the Fairy God Mother in Dragon's Keep (primary profile).
Back to the Grave (20 points): Beat the Skeleton battle in the Peasant Village (primary profile).
Ring Them Bells (20 points): Find and return all three bells in Peasant Village (primary profile).
Paid the Piper (20 points): Defeat the Pied Piper in the Catacombs (primary profile).
Sinking Ship (20 points): Sink the pirate ship (primary profile).
The Royal Highness Is Heinous (50 points): Rumpel Defeated (primary profile).
Swamp Complete (50 points): Complete 100% of the Swamp (primary profile).
Dragon's Keep Complete (50 points): Complete 100% of Dragon's Keep (primary profile).
Peasant Village Complete (50 points): Complete 100% of the Peasant Village (primary profile).
Catacombs Complete (50 points): Complete 100% of the Catacombs (primary profile).
Docks Complete (50 points): Complete 100% of the Docks (primary profile).
Rumpel's Palace Complete (50 points): Complete 100% of Rumpelstiltskin's Palace (primary profile).
Ogre Camp Complete (50 points): Complete 100% of the Ogre Camp (primary profile).
Big Treasure (20 points): Open a big treasure chest (primary profile).
Shopping Spree (50 points): Purchase all store items (primary profile).
Let's Start a Sing-a-Long! (10 points): Use Donkey Radio on an enemy (primary profile).
Green And Mean (10 points): Scare an enemy as Shrek (primary profile).
Ogre Horn (10 points): Sound-shock an enemy with Fiona (primary profile).
Too Cute (10 points): Use Puss In Boots' "big eyes" to charm an enemy (primary profile).
Just Getting Started (10 points): Get your first health upgrade (primary profile).
Team Shrek (30 points): Defeat an enemy with each of the four characters in 1 battle (primary profile).
Fear My Roar (20 points): As Shrek, scare five enemies at once (primary profile).
Queen of the Swamp (20 points): As Fiona, sound-blast five enemies at once (primary profile).
Prrrr... (20 points): As Puss, enchant five enemies at once (primary profile).
Where's the Party? (30 points): Use Donkey Radio on five enemies at once (primary profile).
Ogre Outpost (30 points): Complete the Co-Op puzzle in the Swamp (primary profile).
Ogre Outlaws (30 points): Complete the Co-Op puzzle in the Docks (primary profile).
Ogre Mayhem (30 points): Complete the Co-Op puzzle in the Peasant Village (primary profile).
Let's Have Some Fun (10 points): Defeat an enemy in the Co-Op mode (primary profile).
The Party's Here (20 points): Complete a battle while in the Co-Op mode (primary profile).