Heres a List of all avaters collected after 13/04/10
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Congratulations! You found the 'Doogle' Hidden Avatar! 13/04/10

Congratulations! You found the 'Arrr...' Hidden Avatar! 13/04/10

Congratulations! You found the 'Astronaut' Hidden Avatar! 13/04/10

Congratulations! You found the 'Balloon' Hidden Avatar! 13/04/10

Congratulations! You found the 'Black' Hidden Avatar! 13/04/10

Congratulations! You found the 'Bling' Hidden Avatar! 13/04/10

Cat Burglar 13/04/10

Congratulations! You found the 'Cheese' Hidden Avatar! 13/04/10

Dark Chocolate 13/04/10

Congratulations! You found the 'Dukka Pirates' Hidden Avatar! 13/04/10

Congratulations! You found the 'Easter' Hidden Avatar! 13/04/10

Congratulations! You found the 'Festival' Hidden Avatar! 13/04/10

Congratulations! You found the 'Fidge' Hidden Avatar! 13/04/10

reached 200 Avaters!

Congratulations! You found the 'Gutur' Hidden Avatar! 13/04/10

Congratulations! You found the 'Happy Birthday' Hidden Avatar! 13/04/10

Congratulations! You found the 'Hospital' Hidden Avatar! 13/04/10

Congratulations! You found the 'Apartment' Hidden Avatar! 13/04/10

Congratulations! You found the 'I Love My Minipet' Hidden Avatar! 13/04/10

Congratulations! You found the 'Jokemo' Hidden Avatar! 13/04/10

Mailo 13/04/10

Congratulations! You found the 'Marasites' Hidden Avatar! 13/04/10

Congratulations! You found the 'Push' Hidden Avatar! 13/04/10

Congratulations! You found the 'Red' Hidden Avatar! 13/04/10

Congratulations! You found the 'Fizzy' Hidden Avatar! 13/04/10

Congratulations! You found the 'Maisonette' Hidden Avatar! 13/04/10

Congratulations! You found the 'Shack' Hidden Avatar! 13/04/10

Congratulations! You found the 'Sketch' Hidden Avatar! 13/04/10

Congratulations! You found the 'Volum' Hidden Avatar! 13/04/10

Mint Chocolate 13/04/10

Congratulations! You found the 'Ancient' Hidden Avatar! 14/04/10

Congratulations! You found the 'Fairy' Hidden Avatar! 14/04/10

Congratulations! You found the 'Booster' Hidden Avatar! 14/04/10

Congratulations! You found the 'Burnt' Hidden Avatar! 14/04/10

Congratulations! You found the 'Sizzle' Hidden Avatar! 14/04/10

Congratulations! You found the 'Hammy' Hidden Avatar! 14/04/10

Congratulations! You found the 'Maths' Hidden Avatar! 14/04/10

Congratulations! You found the 'Starry' Hidden Avatar! 14/04/10

Congratulations! You found the 'Batz' Hidden Avatar! 14/04/10

Congratulations! You found the 'Knutt House' Hidden Avatar! 14/04/10

Congratulations! You found the 'Milk Chocolate' Hidden Avatar! 14/04/10

Congratulations! You found the 'Naoen' Hidden Avatar! 14/04/10

Congratulations! You found the 'Sad' Hidden Avatar! 14/04/10

Second wave:

Congratulations! You found the 'Water' Hidden Avatar! 25/04/10

Congratulations! You found the 'Mermaid' Hidden Avatar! 25/04/10

Congratulations! You found the 'Fat' Hidden Avatar! 25/04/10

Congratulations! You found the 'Skinny' Hidden Avatar! 25/04/10

Congratulations! You found the 'Happy' Hidden Avatar! 25/04/10

Congratulations! You found the 'White Chocolate' Hidden Avatar! 25/04/10

Congratulations! You found the 'Photo Parlour' Hidden Avatar! 25/04/10

Congratulations! You found the 'Robot' Hidden Avatar! 25/04/10

Congratulations! You found the 'Undying Minipets' Hidden Avatar! 25/04/10

Congratulations! You found the 'Squeek' Hidden Avatar! 25/04/10

Congratulations! You found the 'Psyclone' Hidden Avatar! 25/04/10

Congratulations! You found the 'Orange Chocolate' Hidden Avatar! 25/04/10

Congratulations! You found the 'Scrooge' Hidden Avatar! 25/04/10

Congratulations! You found the 'Mummy' Hidden Avatar! 25/04/10

Congratulations! You found the 'Sundial' Hidden Avatar! 25/04/10

Huge thanks to Deadgirl!
And thanks also to Hanhong