Here is the full list of all 17 Grow Up achievements worth 1,000 gamerscore. It takes around 10-12 hours to unlock all of the achievements on Xbox One.
Unlock all telerouters
Complete the game 100%
Complete all challenges
Collect all crystals
Throw 100 seeds whilst gliding
Rescue MOM
Flower all STARPLANTS
Unlock all seeds
Visit all biomes
Plant 10 Champolines on top of each other
Take a critter to the moon
Blast a critter 100m
Grab two Sporchids simultaneously and ride upwards for 400m
Complete a challenge holding a Critter
Orbit the entire planet in BALL mode
Discover letter block P
Discover the bull and the sheep