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