Here is the full list of all 56 Tuttle: Star Flower Harvest achievements.
Buy the Ball Cap
Buy the Baller Cap
Buy the Gentleman's Full Brim
Buy the Sun Hat
Buy the Bandit Brim
Buy the Cowboy Hat
Buy the Herringbone
Buy the Winter Cap
Grow 1 Flower
Grow 50 Flowers
Grow 100 Flowers
Grow 500 Flowers
Grow 1000 Flowers
Grow 2000 Flowers
Open 10 Boxes
Open 20 Boxes
Open 50 Boxes
Open 100 Boxes
Exterminate 100 Pests
Exterminate 200 Pests
Exterminate 300 Pests
Exterminate 400 Pests
Exterminate 500 Pests
Host 10 Flowers
Host 20 Flowers
Host 30 Flowers
Host 40 Flowers
Host 50 Flowers
Host 60 Flowers
Host 70 Flowers
Host 80 Flowers
Host 90 Flowers
Host 100 Flowers
Host 150 Flowers
Host 50 Yellow Flowers
Host 50 Purple Flowers
Host 50 Red Flowers
Host 50 White Flowers
Grow a Flower to Level 100
Grow a Flower to Level 200
Grow a Flower to Level 300
Grow a Flower to Level 400
Grow a Flower to Level 500
Reach a Garden Score of 1000
Reach a Garden Score of 2000
Reach a Garden Score of 3000
Reach a Garden Score of 4000
Reach a Garden Score of 5000
Reach a Garden Score of 10,000
Recover 98 Hearts from a Heart Flower
Hit a Seed 5 times before it hits the ground
Hit a Seed 10 times before it hits the ground
Hit a Seed 15 times before it hits the ground
Hit a Seed 20 times before it hits the ground
Ending #1
Ending #2