Here is the full list of all 18 Grow Up achievements. It takes around 8-10 hours to unlock all of the achievements on Windows.
Complete all challenges
Complete the game 100%
Unlock all Telerouters
Collect all crystals
Bounce on a Youch 7 times without touching the ground
Discover the bull and the sheep
Ride two Sporchids simultaneously for 400m
Take a Critter to the moon
Rescue MOM
Unlock all seeds
Blast a Critter 100m
Complete a challenge holding a Critter
Throw 100 seeds whilst gliding
Flower all STARPLANTS
Discover letter block P
Orbit the entire planet in BALL mode
Visit all biomes
Plant 10 Champolines on top of each other