Here is the full list of all 28 The Smurfs - there are Mission Vileaf achievements.
Complete the 100% of the game
Find all of the mandrakes
Build all of the upgrades
Find all of the mushrooms
Find every piece of bark
Find every vial
Perform a SmurfoSprint, Jump and SmurfoSplat combo!
Find all of Jokey’s presents
Complete the adventure in Easy mode
Complete the adventure in Normal mode
Complete the adventure in Hard mode
Complete the Chapter: Gargamel
SmurfoSprint for 100 meters
Get across the Laboratory without getting caught by Gargamel
SmurfoGlide for 10 seconds
Make 10 flowers of every color grow by using the Smufizer
Heal the entire village
Find and wake up Lazy 3 times
Make Papa Smurf cough
Complete the Chapter: The Swamp
Destroy 100 crates of Sarsaparilla
Complete the Chapter: The Castle
Perform 10 perfect jumps in a row
Jump on 3 Vilecritters' heads in a row
Build your first upgrade
Complete the Chapter: The Forest
Complete the Chapter: The Village
Find the flower for the Smurfizer