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