Here is the full list of all 25 Alien Spidy achievements.
Get 150,000 points playing through the levels
Complete one level with at least 3 stars
Complete one level with at least 4 stars
Collect 100 score items along several levels
Collect 10 items in a row
Complete all training levels
Get 500,000 points playing through the levels
Get 1,000,000 points playing through the levels
Get 25,000,000 points playing through the levels
Get 500,000,000 points playing through the levels
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Collect 1,000 score items along several levels
Collect 10,000 score items
Collect all high-value score items in the game
Complete one special level
Get at least 3 stars on all special levels
Get at least 4 stars on all special levels
Get 5 stars in all special levels
Complete the Forest environment
Complete the Pond environment
Complete the game
Get at least 3 stars in all levels of the game
Get at least 4 stars in all levels of the game
Get 5 stars in all levels of the game