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